The number of independent ways the gas molecules can move, rotate, or vibrate in three-dimensional space is called degrees of freedom. According to the Equipartition theorem, the total energy of the gas molecules at equilibrium is equally distributed among their degrees of freedom. The internal energy change can be determined by the temperature change, which can be equated to its molar heat capacity at constant volume. From this expression, the molar heat capacity at constant volume can be written in terms of degrees of freedom. By substituting the obtained value in the heat capacities relation, an expression for molar heat capacity at constant pressure is also determined. The molar heat capacity at constant pressure over molar heat capacity at constant volume is the ratio of heat capacities. For instance, at room temperature, a diatomic gas has five degrees of freedom. Substituting this, the ratio of heat capacities equals 1.40. The ratio of molar heat capacities for any gas is always greater than unity, and the calculated values are listed.