How Are Inversion And Critical Temperature Different?

[Rajmhs]

for liquifaction of gases

[Peter Pedant]

taken from gooit

inversion temperature , in thermodynamics and cryogenics is the critical temperature below which a non-ideal gas that is expanded at constant enthalpy will experience a temperature decrease, and above which will experience a temperature increase..

gas has a definite temperature , called its critical temperature, above which it cannot be liquefied, no matter what pressure is exerted upon it. A gas must, therefore, be cooled below its critical temperature before it can be liquefied !!!

[Peter Pedant]

So in the industrial production of nitrous oxide for example

It is expanded thro a porous plug which causes it to cool because this is being done below the inversion temperature and eventually becomes so cool it liquefies


the reason it will liquify is that that one is compressing it below its critical remperature.

see wiki on Joule thomson effect: if you expand a gas and do work against the van der waals forces then the potential energy of the gas increases and so if it is done adiabatically the gas must cool - this effect is seen below the inversion temp - the only three that dont are Hydrogen helium and a third....which have to be cooled below their inversion temps before this effect is seen.

erm.... I dont do this professionally.