. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. luenced by the buoyancy of the air; but such a cor-rection of the weight of a body is seldom necessary, or, indeed, desir-able. Density is sometimes improperly regarded as synonymous withspecific gravity. It is true that the density of a body is in exact propor-tion to its specific gravity, but the former is more correctly the compar-ative bulk of equal weights, while specific gravity is the comp
. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. luenced by the buoyancy of the air; but such a cor-rection of the weight of a body is seldom necessary, or, indeed, desir-able. Density is sometimes improperly regarded as synonymous withspecific gravity. It is true that the density of a body is in exact propor-tion to its specific gravity, but the former is more correctly the compar-ative bulk of equal weights, while specific gravity is the comparativeweight of equal 614 QUANTITATIVE ANALYSIS. Specific Gravity of Liquids. Procure any small bottle holding from 100 to 1000 grains(Fig. 67), and having a narrow neck; counterpoise it in a del-icate balance; fill it to about halfway up the neck with puredistilled water having a temperature of 60° F.; ascertain theweight of the water, and, for convenience, add or subtract adrop or two, so that the weight shall be a round number ofgrains; mark the neck by a diamond or file-point at the partcut by the lower edge of the curved surface of the water. Fig. 67. Fig. 68. Fig. 69. Fig. Specific-gravity Bottles. Consecutively fill up the bottle to the neck-mark with severalother liquids, cooled or warmed to 60° F., first rinsing out thebottle once or twice with a small quantity of each liquid, andnote the weights ; the respective figures will represent therelative weights of equal bulks of the liquids. If the capacityof the bottle is 10, 100, or 1000 grains, the resulting weightswill, without calculation, show the specific gravities of theliquids ; if any other number, a proportional sum must beworked out to ascertain the weight of the liquids as comparedwith 1 (or 1000) of water. Bottles conveniently adjusted tocontain 250, 500, or 1000 grains, or 100 or 50 grammes, ofwater, when filled to the top of their perforated stopper (), and other forms of the instrument
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