So it's so hot that the heat needs to be dissipated. So it goes through this big set of coils on the back of your unit. And it slowly gives off its heat, getting cooler and cooler all the time. But it's still a liquid, okay? And that is important, and it's under pressure, okay? Then, this coil basically punches through to your freezer, and the refrigerant goes through something called an expansion valve, which releases all of the pressure, and that makes the refrigerant immediately evaporate back into a vapor form. Well, this is called a phase change. And as this changing vapor moves through the coil inside the freezer, it absorbs a huge amount of heat from your food, thus freezing it. It's just that simple.When freezing any liquid based food,remember to leave enough space for expansion.