And what that means is all that energy is concentrated on the left side and no energy is found on the right side inside our system. Now, as soon as we remove this artificial barrier, as soon as we open up that door, what exactly will begin to take place? Well, what the second law of thermodynamics tells us is whenever a system is given a chance to, or whenever something is given a chance to, it will always try to become as random as possible. 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.