A text-book on chemistryFor the use of schools and colleges . ed at oneend, and, hav-ing filled it withwater, invert itinto a cup, B,and introduce into it alittle sulphuric ether, which will rise to a. On coveringthe whole with an air-pump jar, and exhausting, theether boils, and gives off a transparent vapor. On re-admitting the air, the ether goes back to the liquid con-dition. By increase of pressure, as well as by diminu-tion of temperature, vapors may be condensed. In the process of evaporation, vapor ft supplied onlyfrom the surface, and consequently is more rapid as thesurface is larger
A text-book on chemistryFor the use of schools and colleges . ed at oneend, and, hav-ing filled it withwater, invert itinto a cup, B,and introduce into it alittle sulphuric ether, which will rise to a. On coveringthe whole with an air-pump jar, and exhausting, theether boils, and gives off a transparent vapor. On re-admitting the air, the ether goes back to the liquid con-dition. By increase of pressure, as well as by diminu-tion of temperature, vapors may be condensed. In the process of evaporation, vapor ft supplied onlyfrom the surface, and consequently is more rapid as thesurface is larger. In the salt-works of Salzburg thebrine is made to trickle through brushwood, and thewater evaporates with great quickness. By coveringan evaporating surface of water with oil, evaporation isentirely suspended. Though vapors occupy more space than the liquidsfrom which they come, the increase of volume is by no Describe the instrument Fig. 30. What effect has diminution ofpressure on vaporization? Describe Fig. 31. What effect has sur-face on evaporation ?.
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