What is the pressure or weight of the air at the sea level, on a unit of surface, or about 14.7 Ibs. to the sq. inch. Hydrogen was liquefied under a pressure of 650 atmospheres. Lubbock called?

atmosphere — The pressure or weight of the air at the sea level, on a unit of surface, or about 14.7 Ibs. to the sq. inch. Hydrogen was liquefied under a pressure of 650 atmospheres. Lubbock. (Webster's 1913.)

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