why are gases liquefied
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Air is liquefied by the Linde process, in which air is alternately compressed, cooled, and expanded, each expansion results in a considerable reduction in temperature. With the lower temperature the molecules move more slowly and occupy less space, so the air changes phase to become liquid.
ahmedcmoe:
dude I am asking why is it liquefied not how??
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L.P.G. which is used for cooking. In the cylinder petrol is in liquid form. When it is lighted it becomes gas.
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