at what pressure does air become liquid?

Question

i am looking for PSI

Answer 1

The critical point of air is 132 Kelvin and 61 atmospheres. This means that at normal temperature of 20C or 292 Kelvin it is impossible to compress air to a liquid form - it remains a gas at ALL pressures. You can only compress it to a liquid once it is already below 132 Kelvin, and this will take 61 atmospheres pressure at that point.

Answer 2

Liquid Air Temperature

Answer 3

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The Atmosphere How is the atmosphere structured? The atmosphere consists of four distinct layers, which are seperated by a boundaries that end in the suffix "pause". There is a lot of information in the Earth Science Reference Tables page 14. Troposphere-This layer of the atmosphere is closest to the earth and 99% of all weather takes place here because most of the water vapor is located here. Stratosphere-This layer is above the troposphere and contains ozone, which is an important gas, because it absorbs cancer-causing ultra violet rays from the Sun. Mesosphere-This layer is above the stratosphere. Thermosphere-This is the uppermost layer of the atmosphere. Earth Science Reference Table page 14: How do we describe the present condition of the atmosphere? The present condition of the atmosphere is called WEATHER and it is described using observations of temperature, air pressure, humidity, wind, cloudiness and precipitation. What is temperature? Temperature is a measure of the average kinetic energy of the particles of a substance. In other words, the more molecules vibrate within a substance, the higher the temperature. Measurement - There are three scales that measure temperature: CELSIUS, FAHRENHEIT AND KELVIN scales. There is a conversion scale on page 13 of your ESRT. Maps - Meteorologists find it useful to map temperatures and they use lines to connect equal temperatures called Isotherms. What is air pressure and how is it used to predict the weather? Air Pressure - Air pressure is also called barometric or atmospheric pressure. By definition, it is the weight of the atmosphere pushing down on the earth. Barometer - A barometer is the instrument that measures air pressure and it uses units of millibars (mb) or inches of mercury (inches). Factors that affect air pressure: Temperature - As the temperature of the air increases, the air pressure decreases, which is an indirect relationship. Humidity - As the humidity of the air increases, the air pressure decreases, which is an indirect relationship. You might ask "WHY?": Humid air is lighter than dry air. When water vapor enters dry air, it does not squeeze in between the molecules of air. Instead, the water vapor pushes out many of the air's heaviest molecules like Nitrogen and Oxygen. In other words, lighter molecules of water vapor replace heavier molecules and the result is the air weighs less and therefore has less air pressure. High air pressure - means that the atmosphere is heavy at that location and from our notes above, you can conclude that the air is probably cool and dry (if you are not sure, see notes above). So, if the barometer indicates high pressure or rising air pressure, you can conclude that the weather will be cool and dry. Low air pressure - means that the atmosphere is not heavy at that location and from our notes above, you can conclude that the air is probably warm and humid (if you are not sure, see notes above). So, if the barometer indicates low pressure or falling air pressure, you can conclude that the weather will be warmer and humid. Maps - Meteorologists find it useful to map air pressure and they use lines to connect equal equal air pressures called Isobars

Answer 4

It also depends on temperature. What temp are we talking about? The Lower the temperature, the less of the pressure you will need.

At 1 atm, 77 K is liquifaction point of Nitrogen. Air is ~75% nitrogen. This is as much as I can tell you from off the top of my (right now not so sober) head. 4 K is liqification point for helium.

Look it up in CRC book.

Answer 5

The Linda machine makes 251 atm for air Liquadation around -32centigrade degrees.

Answer 6

Not all gases have same pressure to becomes liquid , this depend on the gas molecules

Answer 7

I took thermodynamics in college, and all I can tell you is that it depends on the volume that the air occupies and the temperature, but you cant use the ideal gas law to figure it out, you have to look it up in these special tables. The ideal gas law is not valid for any gas that is close to its condensation point.

Answer 8

you know i forgot,but i thought it had something to do with freezing to a celsius level before it becomes liquid.