cp/cv does change with a change in temperature. But does it changes with pressure too if the temperature is kept constant?
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For an ideal gaz, $cp$ and $cv$ are independant of pressure and so is the ratio. (First and second Joule law).
answered Feb 13, 2019 at 10:35
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$\begingroup$ could you please explain how so... with equations $\endgroup$ Commented Feb 13, 2019 at 13:55
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$\begingroup$ You can find the proof at :physics.stackexchange.com/questions/405822/… $\endgroup$ Commented Feb 13, 2019 at 15:52
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$\begingroup$ Does that mean that for a real gas, say air it is not constant? I landed here trying to figure out if the speed of sounds would show (minor) variations with changing pressure. $\endgroup$– OrbitCommented Jan 8, 2021 at 20:14