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The principle behind the working of a refrigerator

March 30, 2011  by: Justeen  Points: 5   Category: Others  Earning $0.10   Views: 1131

When a liquid evaporates it takes in heat energy and cools its surroundings. When the gas condenses back to a liquid, the latent heat is released. This is used to take heat from inside a fridge, and release it outside.

         

When a liquid evaporates it takes in heat energy and cools its surroundings. When the gas condenses back to a liquid, the latent heat is released. This is used to take heat from inside a fridge, and release it outside.

A liquid which evaporates easily is called a volatile liquid. Freon is a volatile liquid used in most fridges. The liquid evaporates in the coils around the ice box or cold plate inside the fridge. This causes cooling.



The freon gas formed is pumped away and pressurised in the condenser on the back of the fridge. Here the freon gas condenses back into liquid. As it condenses it releases the heat energy it has taken in. So heat energy has been taken from food and other thing inside the fridge and released outside it.

If we leave the fridge door open, the pump has to work hard and more heat will be released into the kitchen which will eventually will become hotter.

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