 In that case, the specific heat of the substance is going to increase with temperature, sometimes in a step-like fashion, as more modes become unfrozen and start absorbing part of the input heat energy.For example, the molar heat capacity of nitrogen at constant volume is formula_34 20.6 J/K/mol (at 15 °C, 1 atm), which is 2.49formula_35.That is the value expected from theory if each molecule had 5 degrees of freedom.