How does an electric refrigerator work?

  You can do some refrigerating if you put a drop of perfume or shaving lotion or liquid vanilla flavor on the tip of your nose. In a moment or two the liquid dries away into the air, and the spot on your nose feels much cooler. We say that the liquid evaporated. When liquids evaporate they carry heat away with them.
  Inside your kitchen refrigerator a special liquid in a long metal pipe does the cooling job. The liquid, called freon, evaporates very fast, and so it makes things cold very quickly. It travels around and around in the pipe, so it can be used over and over.
The freon travels first to the part of the refrigerator that holds the food. There it evaporates. Then, carrying heat with it, it goes on through the pipe, out of the refrigerator box, to a radiator where it gets rid of the heat it collected inside the box. Now the freon is ready lo return and carry away more heat, keeping the refrigerator cold.
  The electric machinery in the refrigerator runs a pump that pushes the freon around and around through the pipe.