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How expansion is a cooling process and compression is a heating process ?
THE AIR CONTAIN CERTAIN NUMBER OF MOLECULES , the molecule have a certain amount of heat energy , when the air is compressed trhe total heat enrgy now occupies a smaller volume , unless the heat is rapidly removed , the air is being compressed the air temp has to be increased beacuse the heat energy per unit volume is increasing . now imagine a gas was in cylinder and expand by pushing agnaist a piston , the movement will involve of work being done , the work will need energy which will come from kinetic energy , HOPE IT CLEARS ALL THE BEST ..
Thanku so mucn it was helping..Does it mean the expansion is a cooling effect only in a closed containers or vessels etc not in the atmosphere ?
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