by naimagul
 P: 10 An ideal gas with g =1.5 is expanded adiabatically. How many times has the gas to be expanded to reduce the rms velocity of molecules 2 times?
 Homework Sci Advisor HW Helper Thanks P: 9,656 rms speed = √(3kT/m), where k is the Boltzmann constant and m the mass of one molecule. So to halve the speed you need 1/4 of the absolute temperature. For adiabatic process, T.V$^{γ-1}$ = constant With γ = 1.5 you'd need 16 times the volume.
 P: 10 Thanks for your help. It was great solving the problem.

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