Let's suppose the kinetic energy of some gas molecule one is equal to kinetic energy of gas molecule two because they have the same temperature. Now, let's also assume that gas molecule two has a larger mass than gas molecule one. So gas molecule two is heavier. So let's rewrite these guys in terms of our mathematical formula for kinetic energy, namely one two, MV squared. The one subscript simply represents gas molecule one, and the two subscript simply represents gas molecule two. So blue is one, red is two.