| 单词 |
precipitator |
| 释义 |
precipitator|prɪˈsɪpɪteɪtə(r)|
Also 7 -er.
[a. late L. præcipitātor a destroyer, overthrower: see precipitate v. and -or.]
One who or that which precipitates.
1. One who brings something to pass quickly or suddenly; a hastener.
a1660Hammond Serm. Luke ix. 55 Wks. 1684 IV. 590 Zealots..as it prov'd were the hastners and precipitators of the destruction of the Kingdom.
2. a. Chem. and Physics. Something that causes precipitation; a precipitant. b. An apparatus for precipitation; spec. (a) a tank for purifying hard water or sewage, a precipitating-tank; (b) an apparatus for removing particulate matter such as dust or smoke from a gas by passing it between electrodes so that the particles acquire an electric charge and are attracted to an oppositely charged surface.
1681tr. Belon's Myst. Physick Introd. 20, I have found Antimony, Allum, and Coral, to be most powerful Dulcif[i]ers, Precipitaters, and Expulsers of divers sorts of Acides. 1883Haldane Workshop Receipts Ser. ii. 350/1 The mother-liquor is conducted through the pipe for mother-water to the precipitators. 1886American XI. 166 The slopes of elevations towards the sea are great precipitators of rain. 1919Jrnl. Amer. Chem. Soc. XLI. 587 (heading) An electrical precipitator for analyzing smokes. 1958Engineering 28 Feb. 274/3 Dust is extracted from the ‘used’ air by electrostatic precipitators. 1971Time 7 June 61/3 Equip the plants' stacks with electrostatic precipitators and wet scrubbers that would cut air pollution by 99%. |
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