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

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    Joule Thomson
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The Joule-Thomson effect describes the temperature change that occurs when a real gas expands adiabatically, which can lead to either cooling or heating, unlike ideal gases that always cool. This phenomenon is significant because it highlights the unique behavior of real gases during expansion, particularly the potential for temperature increase. The discussion emphasizes the distinction between isentropic and general adiabatic processes, clarifying common misconceptions. Additionally, the historical importance of the Joule-Thomson coefficient in developing the absolute temperature scale is noted. Understanding this effect is crucial for applications in thermodynamics and gas processing.
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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
 
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Question: did you look at wikipedia before posting?

jarman007 said:
we all know when a ideal gas is expanded adiabatically it temperature decreases
You seem to be thinking of isentropic, not general, adiabatic expansion.

jarman007 said:
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.
 
So unique thing about joule thomson effect is increasing of temperature on expansion
 
In addition to the above comments, historically, measurement of the Joule-Thompson coefficient led to the development of the absolute (Kelvin) temperature scale.
 

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