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(), n.[OE. vapour, OF. vapour, vapor, vapeur, F. vapeur, L. vapor; probably for cvapor, and akin to Gr. smoke, to breathe forth, Lith. kvepti to breathe, smell, Russ. kopote fine soot. Cf. Vapid.] [Written also vapour.] 1. (Physics) Any substance in the gaseous, or ariform, state, the condition of which is ordinarily that of a liquid or solid. The term vapor is sometimes used in a more extended sense, as identical with gas; and the difference between the two is not so much one of kind as of degree, the latter being applied to all permanently elastic fluids except atmospheric air, the former to those elastic fluids which lose that condition at ordinary temperatures. The atmosphere contains more or less vapor of water, a portion of which, on a reduction of temperature, becomes condensed into liquid water in the form of rain or dew. The vapor of water produced by boiling, especially in its economic relations, is called steam. Vapor is any substance in the gaseous condition at the Va"por v. i.[imp. & p. p.Vapored (); p. pr. & vb. n.Vaporing.] [From Vapor, n.: cf. L. vaporare.] [Written also vapour.] 1. To pass off in fumes, or as a moist, floating substance, whether visible or invisible, to steam; to be exhaled; to evaporate. 2. To emit vapor or fumes. [R.] Running waters vapor not so much as standing waters. Bacon. 3. To talk idly; to boast or vaunt; to brag. Poets used to vapor much after this manner. Milton. We vapor and say, By this time Matthews has beaten them. Walpole. Va"por v. t.To send off in vapor, or as if in vapor; as, to vapor away a heated fluid. [Written also vapour.] He'd laugh to see one throw his heart away, Another, sighing, vapor forth his soul. B. Jonson. スポンサード リンク
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