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hydrometer 音標拼音: [hɑɪdr'ɑmətɚ] n. 液體比重計,浮秤 液體比重計,浮秤 hydrometer n 1: a measuring instrument for determining the specific gravity of a liquid or solid [ synonym: { hydrometer}, { gravimeter}] Hydrometer \ Hy* drom" e* ter\, n. [ Hydro-, 1 - meter: cf. F. hydrom[` e] tre.] 1. ( Physics) An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc. [ 1913 Webster] Note: It is usually made of glass with a graduated stem, and indicates the specific gravity of a liquid by the depth to which it sinks in it, the zero of the scale marking the depth to which it sinks in pure water. Extra weights are sometimes used to adapt the scale to liquids of different densities. [ 1913 Webster] 2. An instrument, variously constructed, used for measuring the velocity or discharge of water, as in rivers, from reservoirs, etc., and called by various specific names according to its construction or use, as { tachometer}, { rheometer}, { hydrometer}, { pendulum}, etc.; a current gauge. HydrometricHYDROMETER. An instrument for measuring the density of fluids; being immersed in fluids, as in water, brine, beer, brandy, & c., it determines the proportion of their densities, or their specific gravities, and thence their qualities. 2. By, the Act of Congress of January 12, 1825, 3 Story' s' Laws U. S. 1976, the secretary of the treasury is authorized, under the direction of the president of the United States, to adopt and substitute such hydrometer as he may deem best calculated to promote the public interest, in lieu of that now prescribed by law, for the purpose of ascertaining the proof of liquors; and that after such adoption and substitution, the duties imposed by law upon distilled spirits shall be levied, collected and paid, according to the proof ascertained by any hydrometer so substituted and adopted.
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