Air condition
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This post was last edited by Dreamwalker on 2016-8-8 09:09. Is the substance in a liquid state at an air pressure of 6.4 MPa and a temperature of -152 degrees Celsius? Is it still in a gas-liquid mixture state?
Wasn’t someone asking about this question not long ago? At this point, it should be in a liquid state
This post was last edited by Dreamwalker on 2016-8-8 at 12:40. Then why is the temperature reading –171 degrees Celsius?
Your pressure before was 6.1 Mpa, right?
This post was last edited by libingtaoff8 on 2016-8-8 09:59 —152 degrees equals 121 K. The pressure is 6.4 Mpa; it should be in a gaseous state. Under both of these conditions, it should be in a liquid state. According to available data, the critical conditions for air are Tc=132.41 K and Pc=3.77 MPa, so any temperature above these values results in a liquid state, and increasing the pressure will not cause the gas to liquefy if the temperature isn’t high enough!
Check the air saturation pressure temperature gauge; it’s very intuitive!
What the original poster is referring to is -152 degrees Celsius, which is below the critical temperature of -140.5 degrees Celsius for air~~
In liquid state, as mentioned above, the critical temperature and pressure of air are -140.5 degrees Celsius and 3.766 Mpa respectively~~
This post was last edited by Matrix on 2016-8-8 19:35. It is a special state, a supercritical state, which is neither gaseous nor liquid. In the supercritical state, the fluid exhibits the dual properties of both gas and liquid phases: it has a high diffusion coefficient and low viscosity similar to those of a gas, as well as a density close to that of a liquid and a strong ability to dissolve substances.