So in order to explain exactly how individual gas molecules behave, scientists came up with something called a kinetic molecular theory. And what this theory is is it's basically a bunch of assumptions that they make about gases that helps us understand how individual gas molecules interact. So the kinetic theory is used to explain the behavior of gases on a nanoscale level. Now, in order to look at the macroscopic level or explain gas behavior on a macroscopic level, much larger level, we have to look at something else. Now, scientists came up with different equations and formulas to explain macroscopic gas behavior. The first formula we're going to look at and discuss is called Boils Law.