In the summertime, have you ever gotten out of a swimming pool and then felt very cold standing in the sun? That’s because the water on your skin is evaporating. The air carries off the water vapor, and with it some of the heat is being taken away from your skin.
This is similar to what happens inside older refrigerators. Instead of water, though, the refrigerator uses chemicals to do the cooling.
There are two things that need to be known for refrigeration.
1.A gas cools on expansion.
2.When you have two things that are different temperatures that touch or are near each other, the hotter surface cools and the colder surface warms up. This is a law of physics called the Second Law of Thermodynamics.
Old Refrigerators
If you look at the back or bottom of an older refrigerator, you’ll see a long thin tube that loops back and forth. This tube is connected to a pump, which is powered by an electric motor.
Inside the tube is Freon, a type of gas. Freon is the brand name of the gas. This gas, chemically is called Chloro-Flouro-Carbon or CFC. This gas was found to hurt the environment if it leaks from refrigerators. So...
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