The critical temperature of a gas is the temperature at or above which no amount of pressure, however great, will cause the gas to liquefy.
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the temperature which occupied to liquefy the gas at its critical pressure and critical volume ,it is represented by Tc. --------------------------------------------------------------------------------------------- Rafaelrz. The Critical Temperature of a fluid is the maximum temperature at which it's vapor form can be liquefied by increasing pressure. The pressure required in this case is the Critical Pressure of the fluid. At the same time the Critical Pressure of a fluid is the maximum pressure at which you can liquefy a gas by reducing it's temperature. The Critical Point of a fluid is the state of the fluid at it's critical temperature and pressure (The Critical State of the fluid), and the specific volume (m3/kg) or molar volume (m3/kmol) observed, is the Critical Volume (mass or molar). An interesting fact is that at the Critical State, the liquid phase and vapor phase at equilibrium show similar properties.
The pressure increase in a closed system.
most gases only become liquid under extreme pressure, not cold.Additional answerThere's a critical temperature, which is different for each gas, above which it won't liquefy even if compressed. Certainly a domestic freezer won't be nearly cold enough for most gases. But carbon dioxide will solidify with no compression at all.
elevation above sea level . . . barometer or GPS air temperature . . . thermometer air pressure . . . barometer
The critical temperature for carbon dioxide is 304K (87.8°F [31°C]). That means that no amount of pressure applied to a sample of carbon dioxide gas at or above 304K (87.8°F [31°C]) will cause the gas to liquefy. At or below that temperature, however, the gas can be liquefied provided sufficient pressure is applied. The corresponding critical pressure for carbon dioxide at 304K (87.8°F [31°C]) is 72.9 atmospheres (~73000 kPa). In other words, the application of a pressure of 72.9 atmospheres of pressure on a sample of carbon dioxide gas at 304K (87.8°F [31°C]) will cause the gas to liquefy. See related link to read more about the Liquefaction of Gases.
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Yes, air pressure is influenced by the amount of air above an area, with pressure decreasing as altitude increases. Temperature also plays a role, as warmer air is less dense and exerts lower pressure. This relationship is described by the ideal gas law.
the temperature which occupied to liquefy the gas at its critical pressure and critical volume ,it is represented by Tc. --------------------------------------------------------------------------------------------- Rafaelrz. The Critical Temperature of a fluid is the maximum temperature at which it's vapor form can be liquefied by increasing pressure. The pressure required in this case is the Critical Pressure of the fluid. At the same time the Critical Pressure of a fluid is the maximum pressure at which you can liquefy a gas by reducing it's temperature. The Critical Point of a fluid is the state of the fluid at it's critical temperature and pressure (The Critical State of the fluid), and the specific volume (m3/kg) or molar volume (m3/kmol) observed, is the Critical Volume (mass or molar). An interesting fact is that at the Critical State, the liquid phase and vapor phase at equilibrium show similar properties.
The pressure increase in a closed system.
The rock in the center of the Earth doesn't liquefy because of the immense pressure from the layers of rock and metal above it. This pressure prevents the rock from melting despite the high temperatures in the Earth's core.
temperature
most gases only become liquid under extreme pressure, not cold.Additional answerThere's a critical temperature, which is different for each gas, above which it won't liquefy even if compressed. Certainly a domestic freezer won't be nearly cold enough for most gases. But carbon dioxide will solidify with no compression at all.
Above Critical Pressure. This will depend on the gas and its temperature.
The force exerted by a gas above a liquid is measured as pressure, typically in units such as atmospheres (atm) or pascals (Pa). This pressure is a result of the gas molecules colliding with the liquid surface and is influenced by factors such as temperature and the amount of gas present.
Altitude , weather systems and gravity.Gravity is the reason of the air pressure , of course this is not noticed as the gravity is affecting every where. Also in terms of wind, heat is a major factor due to the varying temperature of night and day, and the fact that gasses tend to 'expand' when heated and 'shrink' when cooled.
LNG is liquefied natural gas, while LPG is liquefied petroleum gas.LNG is mostly methane which is temporarily cooled in order to liquefy the gas. LNG must be refigerated to a cryogenic temperature of about -162C (-260F) in order to liquefy the gas and stays at or slightly above atmospheric pressure. LNG must be refrigerated because room temperature is above the critical point of methane, meaning no liquid can be condensed at this temperature (no matter what the pressure is).LPG is a mixture of propane and butane (in no specific proportion) which is stored in a pressurized container and is stored at room temperature. Butane and propane have a higher critical point, and therefore pressurization is sufficient to liquefy the fuel.