Dental chemistry and metallurgy.

  • Mitchell, Clifford, 1854-1939.
Date:
1890
Catalogue details

Licence: Public Domain Mark

Credit: Dental chemistry and metallurgy. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    places exactly its own bulk of water and loses in weight an amount just equal to the weight of water displaced. 49. Specific Gravity.—Relative weights of equal bulks of bodies referred to an assumed standard; for liquids and solids, the standard is distilled water at a temperature of 4° C. or 39.2° F. For gases, the standard is air or hy- drogen. If a substance weighs four times as much as the same bulk of water, it is said to have a sp. gr. of 4. 50. Calculation of Specific Grayity of Solids and Liquids.—(<3;) For solids use the fol- lowing formula: W Sp. gr.= W—W^ in which W== weight of body in air, W^ its weight in water (suspended by a light thread from the scale pan). Example: weight of a body in air, /. e., ordinary weight, is 50 ounces; its weight in water is 42 ounces. W=5o, W 50 W=42, W—W=5o—42or8; =—6.25, W—W 8 sp. gr. In other words the weight of the body divided by the weight of an equal volume (bulk) of water is the specific gravity of the body. (^)If the body is lighter than water, fasten a heavy body to it and weigh in water. Weigh the heavy body in water. Weigh the light