According to the Kinetic Theory of Gases, the average kinetic energy ($E$) of gas molecules is directly proportional to the absolute temperature ($T$). The relationship is given by $E = \frac{3}{2} k_B T$. At absolute zero ($T = 0 \text{ K}$), the kinetic energy becomes zero. Consequently, all molecular motion (translational, rotational, and vibrational) ceases theoretically .