Air and Mine-Gases

AIR is the gaseous substance that envelopes the earth and forms its atmosphere. It is remarkable in the constancy of its composition; for while this is being continually changed as the result of the respiration of men and animals, and by addition of gases arising from organic changes and the products of combustion, it is ever being brought back to normal and the proper balance restored by the processes of plant and vegetable life.
Keywords: Air, Atmosphere, carbon dioxide, carbon dioxide, carbon monoxide, marsh gas, oxygen, Scottish Coal Owners' Association, Coal, Explosion, Mine, Mines, Oxygen
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