| 单词 | relative density |
| 释义 | > as lemmasrelative density relative density n. Physics the ratio of the density of a substance to that of some reference substance (usually water for a liquid, and hydrogen or air for a gas); = specific gravity n. at gravity n. 4c.In quot. 1776 the comparison is with the density of the earth. ΘΚΠ the world > matter > constitution of matter > density or solidity > [noun] > specific gravity density1665 specific gravity1666 solidity1698 gravity1750 relative density1776 1776 W. Kenrick et al. tr. Comte de Buffon Nat. Hist. Animals, Veg., & Minerals VI. xi. 79 This matter might be a kind of pumice stone..whose relative density is here 169/ 72. 1879 J. D. Everett Units & Physical Constants iv. 30 The relative density of water at various temperatures.., the density at 4°C. being taken as unity. 1892 G. F. Barker Physics iii. i. 315 Relative density is the ratio of the absolute density of a gas or vapor to that of air or of hydrogen. 2007 N.Y. Times Guide Essent. Knowl. (ed. 2) 369/1 The lightest metal, lithium, has a relative density of about 0·5, so it floats on water. < as lemmas |
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