(Chem.), the relative weight of gases and vapors as compared with some specific standard, usually hydrogen, but sometimes air. The vapor density of gases and vaporizable substances as compared with hydrogen, when multiplied by two, or when compared with air and multiplied by 28.8, gives the molecular weight.Vapor engine, an engine worked by the expansive force of a vapor, esp. a vapor other than steam.

Vapor
(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.

Vapor
(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.

Vaporability
(Vap`o*ra*bil"i*ty) n. The quality or state of being vaporable.

Vaporable
(Vap"o*ra*ble) a. Capable of being converted into vapor by the agency of heat; vaporizable.

Vaporate
(Vap"o*rate) v. i. [L. vaporare, vaporatum. See Vapor.] To emit vapor; to evaporate. [R.]

Vaporation
(Vap`o*ra"tion) n. [Cf. F. vaporation, L. vaporatio.] The act or process of converting into vapor, or of passing off in vapor; evaporation. [R.]

Vapored
(Va"pored) a.

1. Wet with vapors; moist.

2. Affected with the vapors. See Vapor, n., 5.

Vaporer
(Va"por*er) n. One who vapors; a braggart.

Vaporer moth. (Zoöl.) See Orgyia.

Vaporiferous
(Vap`o*rif"er*ous) a. [L. vaporifer; vapor + ferre to bear.] Conveying or producing vapor.

Vaporific
(Vap`o*rif"ic) a. [L. vapor vapor + facere to make.] (Chem.) Producing vapor; tending to pass, or to cause to pass, into vapor; thus, volatile fluids are vaporific; heat is a vaporific agent.

Vaporiform
(Va*por"i*form) a. Existing in a vaporous form or state; as, steam is a vaporiform substance.

Vaporimeter
(Vap`o*rim"e*ter) n. [Vapor + - meter.] An instrument for measuring the volume or the tension of any vapor; specifically, an instrument of this sort used as an alcoholometer in testing spirituous liquors.

density


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