“…Here c p is the heat capacity at constant pressure, and c V is the heat capacity at constant volume. For an ideal gas c p = c V + R (where R = 8.314 J.mol −1 .K −1 is the ideal gas constant) and c V = f R/2, where f is the number of degrees of freedom (3 for a monatomic ideal gas, 5 for a diatomic ideal gas or a gas of linear molecules and 6 for a polyatomic ideal gas [12,13]). By dividing equation ( 3) by (1), it is possible to find an expression for the volume of the state b…”