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Title: Gravity Balance And Gravitometer
Author: H. F. Goodenough
Source: 1940 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1940
Abstract: Before making a study of tliefe two types of apparatus and tlieir operation it will be well, first, to see what specific gravity really means, and why it is necessary to determine the specific gravity. In the first place, let us distinguisli between the meaning of the density of gas and tlie speciiic gravity of gas. In chemistry and physics, the definition of density is the weight of matter per unit volume of a substance. Whereas, the general definition for specific gravity is the ratio of the density of a substance to the density of some other substance chosen as the standard. In the case of gases, the standard might Ise oxygen-Iiydrogen or air and the commonly accepted standard particularly in regard to gas measurement in the industrial field is air. When considering gas, the density of the gas is the weight of the gas per unit of volume and can be expressed in pounds per cubic foot, grams per cubic centimeter or in any unit of mass and volume desired. The specific gravity of the gas then is the ratio of the density of the gas as measured in certain mass per unit of volume compared to the density of the standard air as represented in the mass per unit of volume under the same conditions of temperature and pressure. The Bureau of Standards gives this definition The term specific gravity means the ratio of the weight of an equal volume of gas to the weight of an equal volume of dry air free from carbon dioxide measured at the same temperature and pressure.

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