A text-book on chemistry : for the use of schools and colleges . stionhas been carried, by this means, as far as possible, bypressing the finger over the opening, it will close it, act-ing, therefore, as a valve. And now, if the bottle be turnedupside down, as at e, the tube dipping beneath some wa-ter in a cup, as soon as the fin-ger is removed the water is press-ed upward, and forms a fountainin vacuo. The pressure of the air dependsprimarily on the fact that it is aheavy body, as may be proved bythe direct experiment ofweighingit. For this purpose, let a lightglass flask, a, Fig. 188, fitte
A text-book on chemistry : for the use of schools and colleges . stionhas been carried, by this means, as far as possible, bypressing the finger over the opening, it will close it, act-ing, therefore, as a valve. And now, if the bottle be turnedupside down, as at e, the tube dipping beneath some wa-ter in a cup, as soon as the fin-ger is removed the water is press-ed upward, and forms a fountainin vacuo. The pressure of the air dependsprimarily on the fact that it is aheavy body, as may be proved bythe direct experiment ofweighingit. For this purpose, let a lightglass flask, a, Fig. 188, fitted witha stop-cock, be counterpoised atthe balance; then let the air beexhausted from it, and its weightdetermined again. It will nowbe found lighter than before; butupon opening the stop-cock itwill regain its original made in this man-ner show that a flask contain-ing 100 cubic inches will, when O Describe a simple method by which partial exhaustion may be pro-duced by rhe mouth. How may the weight of air be directly ascertained ? Fig. 196 SPECIFIC GRAVITY OF GASES.
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Keywords: ., bookauthordraperjohnwilliam1811, bookcentury1800, bookdecade1840
