If the degree of freedom of a gas is $f,$ then the ratio of two specific heats ${C_P}/{C_V}$ is given by

The specific heat of helium at constant volume is $12.6 \ J \ mol^{-1} \ K^{-1}$. The specific heat of helium at constant pressure in $J \ mol^{-1} \ K^{-1}$ is about (Assume the temperature of the gas is moderate,universal gas constant,$R=8.314 \ J \ mol^{-1} \ K^{-1}$)

Which of the following is a universal constant?

If $\frac{R}{C_v} = 0.67$,identify the gas.

Write definitions of molar specific heat at constant pressure and constant volume.

For a certain gas,the ratio of specific heats is given to be $\gamma = 1.5$. For this gas,