Well here is the perfect answer to your question. CO2 gas forced into this cylinder, the more it’s forced, and the more inner molecules get close to each other. The molecules inside the cylinder get so close that crowding of gas happens and the movement of the molecules become very slow. When the molecules slow down, they lose heat energy and hence get cold.
http://www.yacylinders.com/sea....mless-gas-cylinder/n
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