The Elements of Physics; a Text-Book for High Schools And Academies
The Elements of Physics; a Text-Book for High Schools And Academies
Alfred Payson Gage
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) is usually etched on bottles constructed for this purpose. Apply formula (2). 117. The Densimeter. The principle of the densi- meter (commonly called hydrometer) is based upon two facts : (1) a floating solid sinks until it displaces its own weight of the liquid in which it floats j (2) the volumes of two liquids displaced by the same floating solid vary inversely as their densities. Experiment 4. Take a prism of paraffined wood (Fig. 108) i inch square and 5 inches long, with a quarter-inch ...scale on one of its faces. It should be so loaded as to assume a vertical position and sink just 4 inches when placed in water. It dis- places, therefore, a volume, V (i X -- X 4 = 1 cu. In. ), of water. Place it in some liquid whose specific density is sought. It displaces a volume, V, of this liquid. Then f = the specific density of the given liquid. This experi- l ment illustrates the principle on which the densimeter is based. - FIG. 108. Instead of a prism of wood, a glass tube, A (Fig. 109), terminating in a bulb containing shot or mercury, is generally used.
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