5 What is compressed air?
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Compressed air is regular air, the volume of which has been decreased with the help of a compressor. Compressed air, just like regular air, consists mostly of hydrogen, oxygen and water vapor. Heat is generated when the air is compressed, and the pressure of the air is increased.
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Compressed air is air kept under a pressure that is greater than atmospheric pressure. ... Compressed air brakes are also found on large highway vehicles. Compressed air is used as a breathing gas by underwater divers
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