What are the refrigerators? How are they Chill the contents inside a fridge?

 What are the refrigerators? How are they Chill the contents inside a fridge?

 To understand refrigeration,pour a small quantity of petrol in your hand and expose it to atmosphere. The petrol evaporates leaving a cooling sensation.This is because the petrol has taken the heat from the hand transformed into vapour.

 The working substance  in the refrigerator is called as refrigerant.It is compressed to a high pressure and then allowed to condense by rejecting its heat to the atmosphere surrounding it.The liquid is then

allowed to expand at a low pressure.During this process it absorbs the heat from the space inside the refrigerator and become a vapour. The above cycle is repeated in vapour compression refrigeration which differs fundamentally from vapour absorption system.

 The major compounds in a refrigerator and halo carbon compounds (which includes halogens :chlorine,fluorine and bromine) hydrocarbons (such as methane,ethane and propane) ,inorganic carbons (such as ammonia,wtare and air) and unsaturated organic compounds (hydrocorbon with ethylene and propylene base).