Misplaced Pages

#808191

88-459: The classification of "combat vehicle" is a very broad category, and may include armored cars , armored personnel carriers , infantry fighting vehicles , infantry mobility vehicles , MRAPs , and tanks . Improvised fighting vehicles such as technicals can also count as combat vehicles. Most modern combat vehicles have vehicle armor , offensive or defensive weaponry , and sufficient space to carry passengers , equipment , or materiel ; if

176-903: A Fordson truck in Egypt . By the start of the new war, the German army possessed some highly effective reconnaissance vehicles, such as the Schwerer Panzerspähwagen . The Soviet BA-64 was influenced by a captured Leichter Panzerspähwagen before it was first tested in January 1942. In the second half of the war, the American M8 Greyhound and the British Daimler Armoured Cars featured turrets mounting light guns (40 mm or less). As with other wartime armored cars, their reconnaissance roles emphasized greater speed and stealth than

264-561: A German-built Daimler motor in 1899. and a single prototype was ordered in April 1899 The prototype was finished in 1902, too late to be used during the Boer War . The vehicle had Vickers armor, 6 mm (0.24 in) thick, and was powered by a four-cylinder 3.3 L (200 cu in) 16 hp (12 kW) Cannstatt Daimler engine, giving it a maximum speed of around 9 mph (14 km/h). The armament, consisting of two Maxim guns ,

352-520: A Mannesmann-MULAG  [ de ] armored car to break through the Germans' lines and force the Germans to retreat. The British Royal Air Force (RAF) in the Middle East was equipped with Rolls-Royce Armoured Cars and Morris tenders. Some of these vehicles were among the last of a consignment of ex- Royal Navy armored cars that had been serving in the Middle East since 1915. In September 1940

440-601: A 1 cm sample cell. Aquatic plants , algae , and other photosynthetic organisms can live in water up to hundreds of meters deep, because sunlight can reach them. Practically no sunlight reaches the parts of the oceans below 1,000 metres (3,300 ft) of depth. The refractive index of liquid water (1.333 at 20 °C (68 °F)) is much higher than that of air (1.0), similar to those of alkanes and ethanol , but lower than those of glycerol (1.473), benzene (1.501), carbon disulfide (1.627), and common types of glass (1.4 to 1.6). The refraction index of ice (1.31)

528-473: A cheaper weapon for use in underdeveloped regions. During World War II , most armoured cars were engineered for reconnaissance and passive observation, while others were devoted to communications tasks. Some equipped with heavier armament could even substitute for tracked combat vehicles in favorable conditions—such as pursuit or flanking maneuvers during the North African campaign . Since World War II

616-412: A comparable halon unit. Germany uses this system as a replacement for its halon system. Some systems, such as Germany's previous extinguisher, have a second shot of suppressant to mitigate re-ignition or the effects of a second hit. Though not as instantaneous, portable crew-operable extinguishers are also used inside and outside the vehicle. Typically, portable extinguishers use a CO 2 agent instead of

704-508: A dedicated passenger bay, able to carry up to a dozen or more passengers. Hygiene upkeep is difficult when operating a combat vehicle. Tracked combat vehicles are suited for heavy combat and rough terrain. Wheeled combat vehicles offer improved logistical mobility and optimized speeds on smooth terrain. Silent watch is becoming an increasingly important combat vehicle application. It is a role that requires that all mission requirements be met while keeping acoustic and infrared signature levels to

792-770: A distance. They may consist of weapons such as machine guns , automatic grenade launchers , or simply the presence of firing ports or armored turrets for the crew or infantry to fire their own issued weaponry from. Some combat vehicles may also carry anti-armor or anti-vehicle weaponry such as autocannons or anti-tank guided missiles . High-caliber or dedicated combat vehicles such as tanks or self-propelled weaponry may carry tank guns , multiple rocket launchers , artillery , or anti-aircraft weapons . Most combat vehicles are not optimized for destroying non-traditional targets such as car bombs , though many may be designed to be resistant to explosives. Armored car (military) A military armored ( also spelled armoured ) car

880-588: A few cars with heavier guns. As air power became a factor, armored cars offered a mobile platform for antiaircraft guns. The first effective use of an armored vehicle in combat was achieved by the Belgian Army in August–September 1914. They had placed Cockerill armour plating and a Hotchkiss machine gun on Minerva touring cars, creating the Minerva Armored Car . Their successes in the early days of

968-458: A four-cylinder 35 hp (26 kW) 4.4 L (270 cu in) engine giving it average cross country performance. Both the driver and co-driver had adjustable seats enabling them to raise them to see out of the roof of the drive compartment as needed. The Spanish Schneider-Brillié was the first armored vehicle to be used in combat, being first used in the Kert Campaign . The vehicle

SECTION 10

#1733104915809

1056-481: A large amount of sediment transport that occurs on the surface of the earth. Deposition of transported sediment forms many types of sedimentary rocks , which make up the geologic record of Earth history . The water cycle (known scientifically as the hydrologic cycle) is the continuous exchange of water within the hydrosphere , between the atmosphere , soil water, surface water , groundwater, and plants. Water moves perpetually through each of these regions in

1144-562: A large cannon capable of threatening many tanks. During the Middle Ages, war wagons covered with steel plate, and crewed by men armed with primitive hand cannon , flails and muskets , were used by the Hussite rebels in Bohemia. These were deployed in formations where the horses and oxen were at the centre, and the surrounding wagons were chained together as protection from enemy cavalry. With

1232-748: A less threatening vehicle such as an armored car is more likely to be attacked. Many modern forces now have their dedicated armored car designs, to exploit the advantages noted above. Examples would be the M1117 armored security vehicle of the USA or Alvis Saladin of the post-World War II era in the United Kingdom. Alternatively, civilian vehicles may be modified into improvised armored cars in ad hoc fashion. Many militias and irregular forces adapt civilian vehicles into AFVs (armored fighting vehicles) and troop carriers, and in some regional conflicts these "technicals" are

1320-456: A minimum. For this reason, silent watch often requires the vehicle to operate without use of the main engine and sometimes even auxiliary engines. Many modern combat vehicles often have electronic equipment that cannot be supported solely with auxiliary batteries alone. Auxiliary fuel cells are a potential solution for covert operations. Force trackers are not as prevalent as in air forces, but are still essential components of combat vehicles. In

1408-477: A property that is exploited by cetaceans and humans for communication and environment sensing ( sonar ). Metallic elements which are more electropositive than hydrogen, particularly the alkali metals and alkaline earth metals such as lithium , sodium , calcium , potassium and cesium displace hydrogen from water, forming hydroxides and releasing hydrogen. At high temperatures, carbon reacts with steam to form carbon monoxide and hydrogen. Hydrology

1496-820: A section of the No. 2 Squadron RAF Regiment Company was detached to General Wavell's ground forces during the first offensive against the Italians in Egypt. During the actions in the October of that year the company was employed on convoy escort tasks, airfield defense, fighting reconnaissance patrols and screening operations. During the 1941 Anglo-Iraqi War , some of the units located in the British Mandate of Palestine were sent to Iraq and drove Fordson armored cars. "Fordson" armored cars were Rolls-Royce armored cars which received new chassis from

1584-440: A structure of rigid oxygen atoms in which hydrogen atoms flowed freely. When sandwiched between layers of graphene , ice forms a square lattice. The details of the chemical nature of liquid water are not well understood; some theories suggest that its unusual behavior is due to the existence of two liquid states. Pure water is usually described as tasteless and odorless, although humans have specific sensors that can feel

1672-412: A swimming pool when the light source is sunlight reflected from the pool's white tiles. In nature, the color may also be modified from blue to green due to the presence of suspended solids or algae. In industry, near-infrared spectroscopy is used with aqueous solutions as the greater intensity of the lower overtones of water means that glass cuvettes with short path-length may be employed. To observe

1760-500: A tracked vehicle could provide, so their limited armor, armament and off-road capabilities were seen as acceptable compromises. A military armored car is a type of armored fighting vehicle having wheels (from four to ten large, off-road wheels) instead of tracks , and usually light armor . Armored cars are typically less expensive and on roads have better speed and range than tracked military vehicles. They do however have less mobility as they have less off-road capabilities because of

1848-461: A variety of applications including high-temperature electrochemistry and as an ecologically benign solvent or catalyst in chemical reactions involving organic compounds. In Earth's mantle, it acts as a solvent during mineral formation, dissolution and deposition. The normal form of ice on the surface of Earth is ice I h , a phase that forms crystals with hexagonal symmetry . Another with cubic crystalline symmetry , ice I c , can occur in

SECTION 20

#1733104915809

1936-486: A weaponized vehicle in a combat environment are great. Use of titanium armor on combat vehicles is increasing. The use of titanium can lighten the vehicle's weight. Appliqué armor can be quickly applied to vehicles and has been utilized on a number of combat vehicles, such as the M8 armored gun system . Contemporary combat vehicles may incorporate a fire-suppression system to mitigate damage from fire. Systems can be employed in

2024-489: Is visibly blue due to absorption of light in the region c. 600–800 nm. The color can be easily observed in a glass of tap-water placed against a pure white background, in daylight. The principal absorption bands responsible for the color are overtones of the O–H stretching vibrations . The apparent intensity of the color increases with the depth of the water column, following Beer's law . This also applies, for example, with

2112-439: Is 917 kg/m (57.25 lb/cu ft), an expansion of 9%. This expansion can exert enormous pressure, bursting pipes and cracking rocks. In a lake or ocean, water at 4 °C (39 °F) sinks to the bottom, and ice forms on the surface, floating on the liquid water. This ice insulates the water below, preventing it from freezing solid. Without this protection, most aquatic organisms residing in lakes would perish during

2200-519: Is a transparent, tasteless, odorless, and nearly colorless chemical substance . It is the main constituent of Earth 's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent ). It is vital for all known forms of life , despite not providing food energy or organic micronutrients . Its chemical formula, H 2 O , indicates that each of its molecules contains one oxygen and two hydrogen atoms , connected by covalent bonds . The hydrogen atoms are attached to

2288-510: Is a wheeled armoured fighting vehicle , historically employed for reconnaissance , internal security , armed escort, and other subordinate battlefield tasks. With the gradual decline of mounted cavalry , armored cars were developed for carrying out duties formerly assigned to light cavalry . Following the invention of the tank , the armoured car remained popular due to its faster speed, comparatively simple maintenance and low production cost. It also found favor with several colonial armies as

2376-489: Is at a temperature of 273.16 K (0.01 °C; 32.02 °F) and a pressure of 611.657 pascals (0.00604 atm; 0.0887 psi); it is the lowest pressure at which liquid water can exist. Until 2019 , the triple point was used to define the Kelvin temperature scale . The water/vapor phase curve terminates at 647.096 K (373.946 °C; 705.103 °F) and 22.064 megapascals (3,200.1 psi; 217.75 atm). This

2464-428: Is greater than the repulsion between the hydrogen atoms. The O–H bond length is about 0.096 nm. Other substances have a tetrahedral molecular structure, for example methane ( CH 4 ) and hydrogen sulfide ( H 2 S ). However, oxygen is more electronegative than most other elements, so the oxygen atom has a negative partial charge while the hydrogen atoms are partially positively charged. Along with

2552-483: Is important in many geological processes. Groundwater is present in most rocks , and the pressure of this groundwater affects patterns of faulting . Water in the mantle is responsible for the melt that produces volcanoes at subduction zones . On the surface of the Earth, water is important in both chemical and physical weathering processes. Water, and to a lesser but still significant extent, ice, are also responsible for

2640-466: Is it a noble gas (and therefore is not removed from the atmosphere through chemical reactions with other elements), but comparisons between the abundances of its nine stable isotopes in the modern atmosphere reveal that the Earth lost at least one ocean of water early in its history, between the Hadean and Archean eons. Any water on Earth during the latter part of its accretion would have been disrupted by

2728-498: Is known as the critical point . At higher temperatures and pressures the liquid and vapor phases form a continuous phase called a supercritical fluid . It can be gradually compressed or expanded between gas-like and liquid-like densities; its properties (which are quite different from those of ambient water) are sensitive to density. For example, for suitable pressures and temperatures it can mix freely with nonpolar compounds , including most organic compounds . This makes it useful in

Combat vehicle - Misplaced Pages Continue

2816-413: Is lower than that of liquid water. In a water molecule, the hydrogen atoms form a 104.5° angle with the oxygen atom. The hydrogen atoms are close to two corners of a tetrahedron centered on the oxygen. At the other two corners are lone pairs of valence electrons that do not participate in the bonding. In a perfect tetrahedron, the atoms would form a 109.5° angle, but the repulsion between the lone pairs

2904-422: Is poor at dissolving nonpolar substances. This allows it to be the " solvent of life": indeed, water as found in nature almost always includes various dissolved substances, and special steps are required to obtain chemically pure water . Water is the only common substance to exist as a solid , liquid, and gas in normal terrestrial conditions. Along with oxidane , water is one of the two official names for

2992-453: Is said to be more compatible with tight urban spaces designed for wheeled vehicles. However, they do have a larger turning radius compared to tracked vehicles which can turn on the spot and their tires are vulnerable and are less capable in climbing and crushing obstacles. Further, when there is true combat they are easily outgunned and lightly armored. The threatening appearance of a tank is often enough to keep an opponent from attacking, whereas

3080-458: Is the study of the movement, distribution, and quality of water throughout the Earth. The study of the distribution of water is hydrography . The study of the distribution and movement of groundwater is hydrogeology , of glaciers is glaciology , of inland waters is limnology and distribution of oceans is oceanography . Ecological processes with hydrology are in the focus of ecohydrology . The collective mass of water found on, under, and over

3168-519: The Bronze and Iron ages. However, weaponry was not installed on the vehicle, relying on the soldier's carried weapon for armament, and armor was effectively limited to a shield and the thin structure of the chariot, if those were even available or sufficient. With the invention of the automobile , combat vehicles took varying forms, ranging from the lightly armored passenger cars of the World War I era to

3256-479: The Moon-forming impact (~4.5 billion years ago), which likely vaporized much of Earth's crust and upper mantle and created a rock-vapor atmosphere around the young planet. The rock vapor would have condensed within two thousand years, leaving behind hot volatiles which probably resulted in a majority carbon dioxide atmosphere with hydrogen and water vapor . Afterward, liquid water oceans may have existed despite

3344-602: The Royal Naval Armoured Car Division reaching a strength of 20 squadrons before disbanded in 1915. and the armoured cars passing to the army as part of the Machine Gun Corps. Only NO.1 Squadron was retained; it was sent to Russia. As the Western Front turned to trench warfare unsuitable to wheeled vehicles, the armoured cars were moved to other areas. The 2nd Duke of Westminster took No. 2 Squadron of

3432-432: The elements hydrogen and oxygen by passing an electric current through it—a process called electrolysis . The decomposition requires more energy input than the heat released by the inverse process (285.8 kJ/ mol , or 15.9 MJ/kg). Liquid water can be assumed to be incompressible for most purposes: its compressibility ranges from 4.4 to 5.1 × 10  Pa in ordinary conditions. Even in oceans at 4 km depth, where

3520-529: The molar volumes of the liquid and solid phases, and L f {\displaystyle L_{\text{f}}} is the molar latent heat of melting. In most substances, the volume increases when melting occurs, so the melting temperature increases with pressure. However, because ice is less dense than water, the melting temperature decreases. In glaciers, pressure melting can occur under sufficiently thick volumes of ice, resulting in subglacial lakes . The Clausius-Clapeyron relation also applies to

3608-449: The water cycle of evaporation , transpiration ( evapotranspiration ), condensation , precipitation, and runoff , usually reaching the sea. Water plays an important role in the world economy . Approximately 70% of the fresh water used by humans goes to agriculture . Fishing in salt and fresh water bodies has been, and continues to be, a major source of food for many parts of the world, providing 6.5% of global protein. Much of

Combat vehicle - Misplaced Pages Continue

3696-524: The British Ferret are armed with just a machine gun. Heavier vehicles are armed with autocannon or a large caliber gun. The heaviest armored cars, such as the German, World War II era Sd.Kfz. 234 or the modern, US M1128 mobile gun system , mount the same guns that arm medium tanks. Armored cars are popular for peacekeeping or internal security duties. Their appearance is less confrontational and threatening than tanks, and their size and maneuverability

3784-444: The Earth was younger and less massive , water would have been lost to space more easily. Lighter elements like hydrogen and helium are expected to leak from the atmosphere continually, but isotopic ratios of heavier noble gases in the modern atmosphere suggest that even the heavier elements in the early atmosphere were subject to significant losses. In particular, xenon is useful for calculations of water loss over time. Not only

3872-531: The Indo-European root, with Greek ύδωρ ( ýdor ; from Ancient Greek ὕδωρ ( hýdōr ), whence English ' hydro- ' ), Russian вода́ ( vodá ), Irish uisce , and Albanian ujë . One factor in estimating when water appeared on Earth is that water is continually being lost to space. H 2 O molecules in the atmosphere are broken up by photolysis , and the resulting free hydrogen atoms can sometimes escape Earth's gravitational pull. When

3960-1207: The RNAS to France in March 1915 in time to make a noted contribution to the Second Battle of Ypres , and thereafter the cars with their master were sent to the Middle East to play a part in the British campaign in Palestine and elsewhere The Duke led a motorised convoy including nine armoured cars across the Western Desert in North Africa to rescue the survivors of the sinking of the SS Tara which had been kidnapped and taken to Bir Hakiem. In Africa, Rolls Royce armoured cars were active in German South West Africa and Lanchester Armoured Cars in British East Africa against German forces to

4048-577: The bent structure, this gives the molecule an electrical dipole moment and it is classified as a polar molecule . Water is a good polar solvent , dissolving many salts and hydrophilic organic molecules such as sugars and simple alcohols such as ethanol . Water also dissolves many gases, such as oxygen and carbon dioxide —the latter giving the fizz of carbonated beverages, sparkling wines and beers. In addition, many substances in living organisms, such as proteins , DNA and polysaccharides , are dissolved in water. The interactions between water and

4136-520: The boiling point, but with the liquid/gas transition the vapor phase has a much lower density than the liquid phase, so the boiling point increases with pressure. Water can remain in a liquid state at high temperatures in the deep ocean or underground. For example, temperatures exceed 205 °C (401 °F) in Old Faithful , a geyser in Yellowstone National Park . In hydrothermal vents ,

4224-785: The chemical compound H 2 O ; it is also the liquid phase of H 2 O . The other two common states of matter of water are the solid phase, ice , and the gaseous phase, water vapor or steam . The addition or removal of heat can cause phase transitions : freezing (water to ice), melting (ice to water), vaporization (water to vapor), condensation (vapor to water), sublimation (ice to vapor) and deposition (vapor to ice). Water differs from most liquids in that it becomes less dense as it freezes. In 1 atm pressure, it reaches its maximum density of 999.972 kg/m (62.4262 lb/cu ft) at 3.98 °C (39.16 °F), or almost 1,000 kg/m (62.43 lb/cu ft) at almost 4 °C (39 °F). The density of ice

4312-433: The desired result. Conversely, a pressure cooker can be used to decrease cooking times by raising the boiling temperature. In a vacuum, water will boil at room temperature. On a pressure/temperature phase diagram (see figure), there are curves separating solid from vapor, vapor from liquid, and liquid from solid. These meet at a single point called the triple point , where all three phases can coexist. The triple point

4400-564: The engine and crew compartments and portable systems may be mounted inside and outside the vehicle as well. Automatic fire suppression systems activate instantaneously upon the detection of fire and have been shown to significantly improve crew survivability. Halon fire suppression systems quickly inundate an affected fire breach with a flood of halon to extinguish leaking fuel. Halon remains necessary for crew compartment fire suppression due to space and weight constraints, and toxicity concerns. Nitrogen systems take up about twice as much space as

4488-435: The first two both apply, the vehicle may be considered an armored fighting vehicle . For much of history, most soldiers not fighting on foot (e.g. cavalry ) used military animals such as horses or elephants , as land vehicles for the most part did not exist. One of the earliest forms of "combat vehicles" was the chariot . In ancient warfare , chariots were used as "battle taxis" and mobile archery platforms during

SECTION 50

#1733104915809

4576-486: The force of gravity . This property is relied upon by all vascular plants , such as trees. Water is a weak solution of hydronium hydroxide—there is an equilibrium 2H 2 O ⇌ H 3 O + OH , in combination with solvation of the resulting hydronium and hydroxide ions. Pure water has a low electrical conductivity , which increases with the dissolution of a small amount of ionic material such as common salt . Liquid water can be split into

4664-479: The form of snow . The gaseous state of water is steam or water vapor . Water covers about 71% of the Earth's surface, with seas and oceans making up most of the water volume (about 96.5%). Small portions of water occur as groundwater (1.7%), in the glaciers and the ice caps of Antarctica and Greenland (1.7%), and in the air as vapor , clouds (consisting of ice and liquid water suspended in air), and precipitation (0.001%). Water moves continually through

4752-450: The fundamental stretching absorption spectrum of water or of an aqueous solution in the region around 3,500 cm (2.85 μm) a path length of about 25 μm is needed. Also, the cuvette must be both transparent around 3500 cm and insoluble in water; calcium fluoride is one material that is in common use for the cuvette windows with aqueous solutions. The Raman-active fundamental vibrations may be observed with, for example,

4840-487: The gunner. One of the first operational armored cars with four wheel (4x4) drive and partly enclosed rotating turret, was the Austro-Daimler Panzerwagen built by Austro-Daimler in 1904. It was armored with 3–3.5 mm (0.12–0.14 in) thick curved plates over the body (drive space and engine) and had a 4 mm (0.16 in) thick dome-shaped rotating turret that housed one or two machine-guns. It had

4928-452: The halon agents used in the past. CO 2 can become lethal to vehicle occupants if it accumulates into a deadly concentration. The U.S. Army has adopted a replacement formula consisting of 50% water , 50% potassium acetate . Alternatives such as powder formulas also exist. Combat vehicles require at least one crew member, though typically at least two (one driver and one gunner). Some vehicles, such as armored personnel carriers, also contain

5016-575: The higher ground pressure. They also have less obstacle climbing capabilities than tracked vehicles. Wheels are more vulnerable to enemy fire than tracks, they have a higher signature and in most cases less armor than comparable tracked vehicles. As a result, they are not intended for heavy fighting; their normal use is for reconnaissance , command, control, and communications, or for use against lightly armed insurgents or rioters. Only some are intended to enter close combat, often accompanying convoys to protect soft-skinned vehicles. Light armored cars, such as

5104-425: The invention of the steam engine , Victorian inventors designed prototype self-propelled armored vehicles for use in sieges, although none were deployed in combat. H. G. Wells ' short story " The Land Ironclads " provides a fictionalized account of their use. The Motor Scout was designed and built by British inventor F.R. Simms in 1898. It was the first armed petrol engine-powered vehicle ever built. The vehicle

5192-416: The liquid is known as boiling ). Sublimation and deposition also occur on surfaces. For example, frost is deposited on cold surfaces while snowflakes form by deposition on an aerosol particle or ice nucleus. In the process of freeze-drying , a food is frozen and then stored at low pressure so the ice on its surface sublimates. The melting and boiling points depend on pressure. A good approximation for

5280-750: The liquid or solid state can form up to four hydrogen bonds with neighboring molecules. Hydrogen bonds are about ten times as strong as the Van der Waals force that attracts molecules to each other in most liquids. This is the reason why the melting and boiling points of water are much higher than those of other analogous compounds like hydrogen sulfide. They also explain its exceptionally high specific heat capacity (about 4.2 J /(g·K)), heat of fusion (about 333 J/g), heat of vaporization ( 2257 J/g ), and thermal conductivity (between 0.561 and 0.679 W/(m·K)). These properties make water more effective at moderating Earth's climate , by storing heat and transporting it between

5368-1070: The long-distance trade of commodities (such as oil, natural gas, and manufactured products) is transported by boats through seas, rivers, lakes, and canals. Large quantities of water, ice, and steam are used for cooling and heating in industry and homes. Water is an excellent solvent for a wide variety of substances, both mineral and organic; as such, it is widely used in industrial processes and in cooking and washing. Water, ice, and snow are also central to many sports and other forms of entertainment, such as swimming , pleasure boating, boat racing , surfing , sport fishing , diving , ice skating , snowboarding , and skiing . The word water comes from Old English wæter , from Proto-Germanic * watar (source also of Old Saxon watar , Old Frisian wetir , Dutch water , Old High German wazzar , German Wasser , vatn , Gothic 𐍅𐌰𐍄𐍉 ( wato )), from Proto-Indo-European * wod-or , suffixed form of root * wed- ( ' water ' ; ' wet ' ). Also cognate , through

SECTION 60

#1733104915809

5456-578: The mid-1990s, U.S. weapon developers envisioned a sophisticated communication network where positions of enemy and friendly forces could be relayed to command vehicles and other friendly vehicles. Friendly vehicles could transmit enemy positions to friendly combat vehicles in combat range for efficient annihilation of the enemy. Logistics support could also monitor front-line combat vehicle fuel and ammunition statuses and move in to resupply depleted vehicles. Weapons mounted on combat vehicles are primarily designed for engaging infantry or other combat vehicles at

5544-418: The oceans and the atmosphere. The hydrogen bonds of water are around 23 kJ/mol (compared to a covalent O-H bond at 492 kJ/mol). Of this, it is estimated that 90% is attributable to electrostatics, while the remaining 10% is partially covalent. These bonds are the cause of water's high surface tension and capillary forces. The capillary action refers to the tendency of water to move up a narrow tube against

5632-534: The oceans may have always been on the Earth since the beginning of the planet's formation . Water ( H 2 O ) is a polar inorganic compound . At room temperature it is a tasteless and odorless liquid , nearly colorless with a hint of blue . The simplest hydrogen chalcogenide , it is by far the most studied chemical compound and is sometimes described as the "universal solvent" for its ability to dissolve more substances than any other liquid, though it

5720-765: The only combat vehicles present. On occasion, even the soldiers of national militaries are forced to adapt their civilian-type vehicles for combat use, often using improvised armor and scrounged weapons. In the 1930s, a new sub-class of armored car emerged in the United States, known as the scout car . This was a compact light armored car which was either unarmed or armed only with machine guns for self-defense. Scout cars were designed as purpose-built reconnaissance vehicles for passive observation and intelligence gathering. Armored cars which carried large caliber, turreted weapons systems were not considered scout cars. The concept gained popularity worldwide during World War II and

5808-488: The oxygen atom at an angle of 104.45°. In liquid form, H 2 O is also called "water" at standard temperature and pressure . Because Earth's environment is relatively close to water's triple point , water exists on Earth as a solid , a liquid , and a gas . It forms precipitation in the form of rain and aerosols in the form of fog . Clouds consist of suspended droplets of water and ice , its solid state. When finely divided, crystalline ice may precipitate in

5896-402: The presence of water in their mouths, and frogs are known to be able to smell it. However, water from ordinary sources (including mineral water ) usually has many dissolved substances that may give it varying tastes and odors. Humans and other animals have developed senses that enable them to evaluate the potability of water in order to avoid water that is too salty or putrid . Pure water

5984-437: The pressure is 400 atm, water suffers only a 1.8% decrease in volume. The viscosity of water is about 10 Pa· s or 0.01 poise at 20 °C (68 °F), and the speed of sound in liquid water ranges between 1,400 and 1,540 metres per second (4,600 and 5,100 ft/s) depending on temperature. Sound travels long distances in water with little attenuation , especially at low frequencies (roughly 0.03 dB /km for 1 k Hz ),

6072-587: The rate of change of the melting temperature with pressure is given by the Clausius–Clapeyron relation : d T d P = T ( v L − v S ) L f {\displaystyle {\frac {dT}{dP}}={\frac {T\left(v_{\text{L}}-v_{\text{S}}\right)}{L_{\text{f}}}}} where v L {\displaystyle v_{\text{L}}} and v S {\displaystyle v_{\text{S}}} are

6160-472: The required crew size with improvements in robotics . Enhancements to automation can help achieve operational effectiveness with a smaller, more economical, combat vehicle force. The automation of combat vehicles has proved to be difficult due to the time latency between the operator controlling the vehicle and the signal being received. Unlike air forces, ground forces must navigate the terrain and plan around obstacles. The rapid tactical implications of operating

6248-636: The south. Armored cars also saw action on the Eastern Front. From 18 February - 26 March 1915, the German army under General Max von Gallwitz attempted to break through the Russian lines in and around the town of Przasnysz , Poland, (about 110 km / 68 miles north of Warsaw) during the Battle of Przasnysz (Polish: Bitwa przasnyska ). Near the end of the battle, the Russians used four Russo-Balt armored cars and

6336-413: The subunits of these biomacromolecules shape protein folding , DNA base pairing , and other phenomena crucial to life ( hydrophobic effect ). Many organic substances (such as fats and oils and alkanes ) are hydrophobic , that is, insoluble in water. Many inorganic substances are insoluble too, including most metal oxides , sulfides , and silicates . Because of its polarity, a molecule of water in

6424-488: The surface of a planet is called the hydrosphere . Earth's approximate water volume (the total water supply of the world) is 1.386 billion cubic kilometres (333 million cubic miles). Liquid water is found in bodies of water , such as an ocean, sea, lake, river, stream, canal , pond, or puddle . The majority of water on Earth is seawater . Water is also present in the atmosphere in solid, liquid, and vapor states. It also exists as groundwater in aquifers . Water

6512-534: The surface temperature of 230 °C (446 °F) due to the increased atmospheric pressure of the CO 2 atmosphere. As the cooling continued, most CO 2 was removed from the atmosphere by subduction and dissolution in ocean water, but levels oscillated wildly as new surface and mantle cycles appeared. Geological evidence also helps constrain the time frame for liquid water existing on Earth. A sample of pillow basalt (a type of rock formed during an underwater eruption)

6600-403: The temperature can exceed 400 °C (752 °F). At sea level , the boiling point of water is 100 °C (212 °F). As atmospheric pressure decreases with altitude, the boiling point decreases by 1 °C every 274 meters. High-altitude cooking takes longer than sea-level cooking. For example, at 1,524 metres (5,000 ft), cooking time must be increased by a fourth to achieve

6688-476: The term is understood today, as they provided little protection for their crews from enemy fire. At the beginning of the 20th century, the first military armored vehicles were manufactured by adding armor and weapons to existing vehicles. The first armored car was the Simms' Motor War Car , designed by F.R. Simms and built by Vickers, Sons & Maxim of Barrow on a special Coventry -built Daimler chassis with

6776-673: The traditional functions of the armored car have been occasionally combined with that of the armoured personnel carrier , resulting in such multipurpose designs as the BTR-40 or the Cadillac Gage Commando . Postwar advances in recoil control technology have also made it possible for a few armoured cars, including the B1 Centauro , the Panhard AML , the AMX-10 RC and EE-9 Cascavel , to carry

6864-458: The upper atmosphere. As the pressure increases, ice forms other crystal structures . As of 2024, twenty have been experimentally confirmed and several more are predicted theoretically. The eighteenth form of ice, ice XVIII , a face-centred-cubic, superionic ice phase, was discovered when a droplet of water was subject to a shock wave that raised the water's pressure to millions of atmospheres and its temperature to thousands of degrees, resulting in

6952-548: The vehicles provided by a local shipbuilder. In London Murray Sueter ordered "fighting cars" based on Rolls-Royce, Talbot and Wolseley chassis. By the time Rolls-Royce Armoured Cars arrived in December 1914, the mobile period on the Western Front was already over. More tactically important was the development of formed units of armored cars, such as the Canadian Automobile Machine Gun Brigade , which

7040-788: The war convinced the Belgian GHQ to create a Corps of Armoured Cars , who would be sent to fight on the Eastern front once the western front immobilized after the Battle of the Yser . The British Royal Naval Air Service dispatched aircraft to Dunkirk to defend the UK from Zeppelins. The officers' cars followed them and these began to be used to rescue downed reconnaissance pilots in the battle areas. They mounted machine guns on them and as these excursions became increasingly dangerous, they improvised boiler plate armoring on

7128-470: The widely fielded Willys MB of World War II , along with a wide variety of other combat vehicles such as half-tracks and multiple classifications of tanks . Development of combat vehicles continued into the Cold War as military tactics and technology evolved, diversifying the role of vehicles in war and making them an essential aspect of modern warfare . The automation of human tasks endeavors to reduce

7216-441: The winter. Water is a diamagnetic material. Though interaction is weak, with superconducting magnets it can attain a notable interaction. At a pressure of one atmosphere (atm), ice melts or water freezes (solidifies) at 0 °C (32 °F) and water boils or vapor condenses at 100 °C (212 °F). However, even below the boiling point, water can change to vapor at its surface by evaporation (vaporization throughout

7304-460: Was a De Dion-Bouton quadricycle with a mounted Maxim machine gun on the front bar. An iron shield in front of the car protected the driver. Another early armed car was invented by Royal Page Davidson at Northwestern Military and Naval Academy in 1898 with the Davidson-Duryea gun carriage and the later Davidson Automobile Battery armored car . However, these were not "armored cars" as

7392-648: Was carried in two turrets with 360° traverse. It had a crew of four. Simms' Motor War Car was presented at the Crystal Palace , London , in April 1902. Another early armored car of the period was the French Charron, Girardot et Voigt 1902 , presented at the Salon de l'Automobile et du cycle in Brussels , on 8 March 1902. The vehicle was equipped with a Hotchkiss machine gun , and with 7 mm (0.28 in) armour for

7480-808: Was equipped with two machineguns and built from a bus chassis. An armored car known as the ''Death Special'' was built at the CFI plant in Pueblo and used by the Badlwin-Felts detective agency during the Colorado Coalfield War . A great variety of armored cars appeared on both sides during World War I and these were used in various ways. Generally, armored cars were used by more or less independent car commanders. However, sometimes they were used in larger units up to squadron size. The cars were primarily armed with light machine guns, but larger units usually employed

7568-690: Was especially favored in nations where reconnaissance theory emphasized passive observation over combat. Examples of armored cars also classified as scout cars include the Soviet BRDM series , the British Ferret , the Brazilian EE-3 Jararaca , the Hungarian D-442 FÚG , and the American Cadillac Gage Commando Scout . Water Water is an inorganic compound with the chemical formula H 2 O . It

7656-784: Was recovered from the Isua Greenstone Belt and provides evidence that water existed on Earth 3.8 billion years ago. In the Nuvvuagittuq Greenstone Belt , Quebec, Canada, rocks dated at 3.8 billion years old by one study and 4.28 billion years old by another show evidence of the presence of water at these ages. If oceans existed earlier than this, any geological evidence has yet to be discovered (which may be because such potential evidence has been destroyed by geological processes like crustal recycling ). More recently, in August 2020, researchers reported that sufficient water to fill

7744-589: Was the first fully mechanized unit in the history. The brigade was established on September 2, 1914, in Ottawa , as Automobile Machine Gun Brigade No. 1 by Brigadier-General Raymond Brutinel . The brigade was originally equipped with eight Armoured Autocars mounting two machine guns. By 1918 Brutinel's force consisted of two motor machine gun brigades (each of five gun batteries containing eight weapons apiece). The brigade, and its armored cars, provided yeoman service in many battles, notably at Amiens. The RNAS section became

#808191