Tuesday 3 May 2016

Internal energy of an ideal gas independent of any thermodynamic variable at constant temperature


https://physics.stackexchange.com/a/199976/170242


In this answer (in the link), it is mentioned that "the internal energy of an ideal gas is independent of volume when considered as a function of volume and temperature."


Later, it is also mentioned that $$\left(\dfrac{\partial U}{\partial X}\right)_T=0$$ for any variable $X$.


From this, it is easy to conclude that internal energy of an ideal gas is a function of temperature only.


But, can one derive this expression mathematically ?





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