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Before we discuss the relative probability of these three assumptions, let us make an experiment. 182 THE MODERN PERIOD. Experiment 23. 1 Spaces between the Molecules. Have ready a dry Kjeldahl flask fitted with a two- hole rubber stopper. Through one hole pass a piece of glass tube. About a cm of this tube should project inside the flask, and about a cm outside, when the stopper is in position. To the outer end of this tube fix 5 or 6 cm of rubber tube carrying two pinch-cocks, one near each e...nd of the rubber tube. Let a piece of glass tube rise from near the bottom of the flask, pass through the second hole in the stopper, and then be bent at a right angle. By means of a bit of small rubber tube connect to this bent glass tube the short arm of another piece of glass tube bent thus : -, |. Let the short arm of the latter tube, which is to serve for a pressure gauge, be about 30 cm long, and the long arm at least 50 cm . Have ready a bath of boiling water, which contains some common salt [to raise the tem- perature above 100].
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