Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 309
artion of dryness, owing to therapid evaporation which takesplace from their surfaces. Thisshould be takMi as natures ad-monition to keep water in the stove urns, and in tanks con-nected with furnaces. The quantity of water vapor present in the air is expressedeither (1) by the mass of vapor per… … Pig. 214. WET AND DRY BULB THEEMOMETER. 293 useful method, and this ratio is called the relative humidity,or simply humidity of the air. It is expressed in per-centages. Thus, relative humidity = 76 per cent., or 0.75,denotes that the air contains three-fourths the quantity ofwater vapor required…
Physics
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