So one set of conditions and second set of conditions. Now, what this law does is it explains macroscopic phenomenon. Like, for example, why is it that when I take a balloon filled with air and I push it hard enough, it explodes? Well, why did that occur? Well, this can be explained by Boyle's Law and I'll show you in a second. Well, this equation can be rearranged in this format if we're dealing with two different sets of conditions.