| 单词 | permanent air |
| 释义 | > as lemmaspermanent air permanent air n. now historical a gas which cannot be readily liquefied, as contrasted with a vapour, which can; cf. permanent gas n. ΚΠ 1665 R. Boyle New Exper. & Observ. Cold ii. ix. 255 We should also be obliged to enquire, whether or no Air, I mean true and permanent Air, can be generated anew, as well out of common water, as many other liquors. 1718 I. Newton Opticks (ed. 2) iii. i. 372 The particles of permanent Air are grosser, and arise from denser Substances than those of Vapours. 1980 Trans. Amer. Philos. Soc. 70 13/2 To put this question in the terms commonly employed in the eighteenth century, is there a real difference between true permanent air and vapors? 2000 M. Crosland in F. L. Holmes & T. H. Levere Instruments & Exper. Hist. Chem. iv. 83 When Boyle spoke of ‘true air’, he..meant permanent air, air that did not condense on standing because it was really, for example, water vapour. < as lemmas |
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