How Does a Refrigerator Work?
Earlier food was preserved by traditional methods like salting and pickling which were not always practical. Nowadays refrigerators are used to preserve food.
They are able to preserve food for long periods by keeping it cool. This cooling process prevents bacteria from attacking and spoiling the food, which in turn reduces wastage of food.
A refrigerator doesn’t use ice to cool itself. Instead, it produces cold with a liquid cooling agent called a “refrigerant.” It works this way: the liquid refrigerant vaporizes (changes to a gas) as it circulates through coils alongside the refrigeration compartment.
As a vapor, the refrigerant draws off the heat from items in the refrigerator, thus reducing their temperature. The vapor is then passed at high pressure through a condenser, where it returns to its liquid form, and continues its cooling cycle.
A common refrigerant in home refrigerators is called “Freon.” The refrigerant gas is compressed to a high pressure which results in rise of temperature.