| 单词 | permanent gas |
| 释义 | > as lemmaspermanent gas permanent gas n. a gas which can be liquefied only at very low temperatures (such as oxygen, hydrogen, or air), and was formerly believed to be incapable of liquefaction (cf. permanent air n., permanently elastic adj. at permanently adv. Compounds); spec. a gas that is above its critical point, and so is impossible to liquefy by pressure alone. ΘΚΠ the world > matter > chemistry > chemical substances > named gases > [noun] > types permanent gas1800 carrier gas1887 flue-gas1898 1751 Chambers's Cycl. (ed. 7) at Air The difference between permanent and transient Air amounts to the same as that between vapour and exhalation.] 1800 Philos. Trans. (Royal Soc.) 90 202 A permanent gas is produced, which is evidently a mixture of oxygenous and hydrogenous gases. 1866 E. Atkinson tr. A. Ganot Elem. Treat. Physics (ed. 2) vi. v. 258 It is natural to suppose that what are ordinarily termed permanent gases are really unsaturated vapours. 1933 A. W. Barton Text Bk. Heat x. 223 These facts favour the view that there is no essential difference between the permanent gases and those which have been liquefied. 1997 Nature 2 Jan. 14/2 Other astonishing discoveries that year [sc. 1847] included Henri Victor Regnault's revelation that not even the permanent gases satisfy perfectly the law of perfect gases. < as lemmas |
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