A short manual of inorganic chemistry / by A. Dupré and H. Wilson Hake.

  • August Dupré
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: A short manual of inorganic chemistry / by A. Dupré and H. Wilson Hake. Source: Wellcome Collection.

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    that a floating body displaces a bulk of the liquid in which it floats, such that the weight of the bulk of liquid displaced is equal to the whole weight of the floating body. In shape it somewhat resembles a fishing-float. It is made of glass or metal, and is so weighted as to float upright. A narrow stem permits it to indicate small variations in the specific gravity of the liquids tested. (3.) By Weighing a Solid in the Liquid and in Water.—This method is based on the principle that a body, when weighed in a liquid of less specific gravity than itself, appears to weigh less than its weight in air, by the weight of an equal bulk of the liquid in which it is immersed. The following example will best illustrate the method: Weight of solid in air = 254 grms. Weight of solid in water = 18-9 ,, Weight of solid in given liquid = 20-6 ,, Loss of weight in water = 6-5 ,, = iceight of bulk of water equal to bulk of solid. Loss of weight in given liquid = 4'8 „ = weight of bulk of liquid equal to bulk of solid. 4-8 Hence, specific gravity of liquid = ^ = 0-73. 0*0 B. SOLIDS. (1.) By Weighing the Solid in Air and in Water.—This method depends on the principle already mentioned (a. 3), that a body of greater specific gravity than a given liquid, will, when weighed in the liquid, weigh less than its whole weight by the weight of an equal bulk of the liquid. Ilence, the loss of weight of the solid in water, represents the weight of an equal volume of water, and we have only to divide the weight in air by the loss of weight in water to find the specific gravity. Example: Weight of solid in air = 36-5 grms. Weight of solid in water = 28’7 ,, Loss of weight in water = 7-8 ,, = toeight of bulk of water equal to bulk of solid. 36-5 Specific Gravity of solid = -yg- r= 4 C79. (2.) By Weighing a Solid in Air and in a Bottle previously Weighed and full of Water.—By this method the difference in weight gives the weight of the water displaced, i.e., of an equal volume of water. An example will best explain it.
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