CP and CV are the principal specific heat of a gas. In terms of mechanical units, CP – CV is equal to
R
$\dfrac{R}{J}$
$\dfrac{R}{MJ}$
$\dfrac{R}{M}$
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A sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T, the mass of each molecules is m. the expression for the density of gas is (k = Boltzmann constant)