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. Now, Boils Law works under certain conditions. Now, if we have a constant temperature and constant number of moles or N constant number of molecules, then we can use something called Boils Law. And what Boils Law relates is it relates volume and pressure.