The Experimental Basis of Chemistry Suggestions for a Series of Experiments Ill
The Experimental Basis of Chemistry Suggestions for a Series of Experiments Ill
Ida Freund
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Density being defined as the mass of unit volume, the numerical value will of course depend on the units used for weight and for volume, and a statement of what these units are should always be given, thus : Density of air = 1*293 grams per litre, the gram and the litre (1 litre = 1000 c. C. ) being the units usually employed in the case of gases. It must be a matter of regret that for some reason unknown, in the case of gases ' density ' and ' specific gravity ' (= relative density) are not ri...gorously and consistently differentiated. Specific gravity (or relative density) being defined as the ratio be- tween the weight of any volume of the substance considered and an equal volume of an arbitrarily chosen standard, is a pure number, the value of which does not depend on the units of weight and of volume used, but does depend on the standard selected ; hence just as the statement of the value of a density should include that of the units used, so the statement of a specific gravity should include that of the standard to which it is referred.
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