And so what that means is these molecules will begin to travel to the other side. Now, a much better way of saying that is in the following way. Whenever energy is given the chance to, energy will tend to spread out and disperse along the tire space in which that energy is found in. Now, in this particular case, because we had the barrier, energy could not have moved to this side because of that barrier. But as soon as we removed that, the molecules tend to move to the other side. And as the molecules move, they also carry that energy.