The ratio CP/CV for gas is 1.29. What is the degree of freedom of the molecules of this gas?
γ = ratio of molar heat capacities at constant pressure to constant volume
f = number of degrees of freedom
(i) becomes :
=> … (ii)
Substituting γ = 1.29 in (ii), we get
f = = 6.89 which is approximately equal to 7.
Thus, the number of degrees of freedom is approximately equal to 7.