So if the molecules are moving, they have a certain amount of kinetic energy and so forth. So each one of these molecules has a certain amount of energy. And the total amount of energy on the left side of this container is equal to the sum of the individual energies of these molecules. So we have molecule one, molecule two, molecule three, molecule four, molecule five, and molecule six. So let's suppose that each one of these molecules carries the same amount of energy, and each energy is equal to one unit. So we have six molecules.