What is the Law of Heat Exchange in Physics

Law of Heat Exchange in Physics


For an isolated system comprising mixture of hot and cold substances, the heat lost by hot substances is equal to the heat gained by cold substances.


Heat lost by hot body = Heat gained by cold body






A refrigerator is a device that is used to keep fruits, vegetables and other eatables cool.




A refrigerator consists of a compressor, condenser and evaporator.




Freon is used as the refrigerant in a refrigerator. This gas liquefies at normal temperature if the pressure is increased.




  1. Compression: Freon gas is first compressed in the compressor of a refrigerator. It is then fed into the condenser.


  1. Condensation: In the condenser, the gas is liquefied under pressure. It converts into a liquid at normal temperature. This gas is then allowed to pass through a valve into the evaporator.


  1. Evaporation: The pressure in the evaporator is comparatively less than in the condenser. Therefore, when liquid Freon enters the evaporator, it evaporates absorbing a large amount of heat. This results in cooling the area around the evaporator. This is where we keep our eatables.
See also  Past Papers of 10th Class Lahore Board 2016 Biology Group II


Development of language skills – listening, reading, writing and speaking. The best way to comprehend a foreign language is the method of immersion in the language environment, that is, a trip abroad. But not everyone can afford it. Therefore, attending an English language school turns out to be the most advantageous option. Methods of teaching English at school

Spread Knowledge

Want to Request for a Book or Novel

If you want to request for a book or a novel which you have not found in our website. Then just fill the form, our editorial team will try to upload the book as soon as possible.

Click Here to Leave a Comment Below 0 comments

Leave a Reply: