Except in Boyle's Law it was p times V equals p two times V two. Now this guy is equal to the constant, because remember, no matter what volume or number of mold we're talking about, as long as this is true, our constant will be the same. So both this guy and this guy equals the same constant. Now, this formula can be applied in many different examples. Let's see one, an easy one in Part E. Suppose I'm given that for three moles, my volume is 22 liters. Now suppose my second volume in my second condition is 44 liters.