Heat Capacity
Molar heat capacity for monatomic idea gas: Cmolar = (3/2)R
When nature allows other forms of energy, such as rotational or vibrational, it seems that all forms of energy have the same amount: equipartition of energy is what this is called.
For a diatomic ideal gas (such as O2 and N2), the result is Cmolar = (5/2)R .