| 释义 |
hygrometer|haɪˈgrɒmɪtə(r)|
[mod. f. Gr. ὑγρο- hygro- + -meter; prob. ad. F. hygromètre (1666 in Hatz.-Darm.).]
An instrument for measuring the humidity of the air or a gas, or the ratio of the amount of moisture actually present in it to that required for saturation. (Formerly often applied to a contrivance for simply indicating the comparative humidity, to which the name hygroscope is more properly given.)
1670E. Tonge in Phil. Trans. V. 1199, I want a good Thermometer, Barometer, and Hygro-meter. 1725Bradley Fam. Dict. s.v. Oat, Wild..Oats is distinguished by a Beard that is made use of to make Hygrometers. 1729Switzer Hydrost. & Hydraul. 207 The Hygrometer, a Specimen of which we have lately had in the Toy wherein the Man comes out..in wet Weather and the Woman in dry. 1791E. Darwin Bot. Gard. i. Notes 172 Mr. Saussure observed in placing his hygrometer in a receiver of an air-pump that..the hair of his hygrometer contracted. 1845Darwin Voy. Nat. i. 4 The hygrometer gave a difference of 29·6 degrees, between the temperature of the air, and the point at which dew was precipitated. |