how does evaporation and condensation are used to cool a refrgerator?this is to help me with my science homework which i am stuck on.

Some gases such as ammonia, sulfur dioxide, butane, and
(the infamous) chlorofluorocarbons (CFC's) can be easily squashed through a pipe by a
compressor to make a liquid. You can demonstrate this with some lighter fuel in a
plastic syringe (without the needle!) This is the condensation
part. When this happens they get hot. This is part of the heat you feel
from the pipes at the back of your refrigerator. The liquid cools as it gives its heat
to the air in your kitchen. The cold liquid then travels through the pipe to the inside
where it passes through a very narrow pipe into a larger pipe where the pressure is
lower and it evaporates rapidly back into a gas. This makes
it extremely cold. This is called the Joule-Thomson effect after the scientists who
discovered it. Heat from your food warms the cold gas in the pipe and then it travels
back out to the compressor where it all happens again.