. 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. ated by the depth to which the hydrometer sinks inthe liquid, the zero of the scale marking the depth to which it sinksin pure water. Hydrometers constructed for special purposes areknown under the names of saccharometer, lactometer, elseometer,urinometer, alcoholometer. Hydrometers require a considerablequantity of liquid fairly to float them, and specific gravities observedwith them are less de
. 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. ated by the depth to which the hydrometer sinks inthe liquid, the zero of the scale marking the depth to which it sinksin pure water. Hydrometers constructed for special purposes areknown under the names of saccharometer, lactometer, elseometer,urinometer, alcoholometer. Hydrometers require a considerablequantity of liquid fairly to float them, and specific gravities observedwith them are less delicate and trustworthy than those obtained bythe balance; nevertheless, they are exceedingly useful for manypractical purposes where the employment of a delicate balancewould be inadmissible. Specific Gravity op Solids in Mass. Weigh a piece (50 to 250 grains) of any solid substanceheavier than water in the usual manner. Then weigh it in•water, by suspending it from a shortened balance-pan by a finethread or hair and immersing in a vessel of water (Fig. 71).The buoyant properties of the water will cause the solid appar-ently to lose weight; this loss in weight is the exact weight of Fig. Weighing a Solid in Water. an equal bulk of water. The weight of the substance and theweight of an equal bulk of water being thus ascertained, a pro-portional sum shows the relative weight of the substance of water. To express the same thing by rule, divide the•weight in air by the loss of weight in water; the resultingnumber is the specific gravity in relation to 1 part of water,the conventional standard of comparison. SPECIFIC GRAVITY. 617 Verify some of the following specific gravities : Aluminium Antimony * Bismuth Coins, English, gold silver ......... bronze Copper . Gold Iron Lead Magnesium Marble Phosphorus Platinum Silver Sulphur Tin Zinc Specific gravities of solid substance
Size: 1760px × 1419px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubject, booksubjectpharmaceuticalchemistry
