A text-book on chemistry. For the use of schools and colleges (1866)
Draper, Henry, 1837-1882 · New York, Harper & brothers · leaf 29
vapor of water thatis produced from the burning body assists in the as-cension, because it is lighter than air. By decline intemperature, the heated air collapses to its original size,the steam condenses, and the balloon descends to thesurface of the earth again. In the operation of cupping, the… … THE AIR-THERMOMETER. 17 ceives for a moment the flame of a spirit-lamp, and isthen quickly applied to the surface of the skin. Thevapor of water condensing, and the heated air contract-ing, a very good vacuum can be made. As the volume of air changes so readily with the tem-perature, becoming less…
Chemistry · Physics
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