a. The gaseous envelope surrounding the Earth. The mixture of gases that surrounds the Earth, being held thereto by gravity. It consists by volume of 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and minute quantities of helium, krypton, neon, and xenon. The atmosphere is so compressed by its own weight that half is within 5.5 km of the Earth's surface. AGI
b. A unit of pressure. A normal atmosphere is equal to the pressure exerted by a vertical column of mercury 760 mm in height at 0 degrees C, and with gravity taken as 980.665 cm/s2 . It equals 14.66 psi (101 kPa). AGI
c. In a furnace, the mixture of gases resulting from combustion. d. The kind of air prevailing in any place, as within a kiln during firing. Kinney
Source: Dictionary of Mining, Mineral, and Related Terms










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