What does the word air mean?
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The atmosphere, a simple non- chemical mixture of oxygen, 1 volume, and nitrogen, 4 volumes, with varying proportions of carbon dioxide, vapor of water, argon, ammonia, nitric acid, and organic matter.
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is an invisible, transparent, inodorous, insipid, ponderable, compressible, and elastic fluid, which, under the form of the atmosphere, surrounds the earth to the height of 15 or 16 leagues Air is essentially composed of two gases, oxygen and nitrogen, in the proportion of 20 of the former to 80 of the latter. Oxygen is the vital portion, but the nitrogen is necessary to dilute it. Air also contains a small portion of carbonic acid gas, and has always floating in it aqueous vapour, different terrestrial emanations, etc. Its effects upon the human body vary according to its greater or less density, temperature, moisture, etc.; hence, change of air is found extremely serviceable in the prevention and cure of certain morbid conditions. See Climate, and Respiration.
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Usage examples for air
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