The molecules of any substance are in continuous motion and interact with neighboring molecules.
Molecules have kinetic energy Ek, which is determined by the formula Ek = m * V ^ 2/2, where m is the mass of the molecule, V is the speed of movement of the molecules.
Molecules have potential interaction energy.
Molecules attract with an increase in the equilibrium distance, and repel with a decrease in the equilibrium distance.
E = Ek + En.
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