What is the Joule Thomson Effect and why does it matter for real gases?

[jarman007]

It occurs when a real gas is allowed to expand adiabatically


we all know when a ideal gas is expanded adiabatically it temperature decreases
so real gas should do the same with minor difference




so what is all the fuss about we all know it will happen

why is it given a special name

 

[cesiumfrog]

Question: did you look at wikipedia before posting?

we all know when a ideal gas is expanded adiabatically it temperature decreases

You seem to be thinking of isentropic, not general, adiabatic expansion.

so real gas should do the same with minor difference
so what is all the fuss about we all know it will happen

This can increase temperature.

 

[jarman007]

So unique thing about joule thomson effect is increasing of temperature on expansion

 

[Andy Resnick]

In addition to the above comments, historically, measurement of the Joule-Thompson coefficient led to the development of the absolute (Kelvin) temperature scale.