This increase in collisions will increase our pressure because by definition, pressure is forced per unit area. And if we have more molecules hitting the walls, we have more force and so a higher pressure. So this is Boyle's Law and Boyle's Law is used to explain macroscopic behavior. So let's examine the graphs of Boyle's Law or a graph of Boyle's Law. Now, we can have two graphs. We can graph volume and pressure.