. Elementary physics and chemistry: second stage. Science. THE BURNING OF A CANDLE. 117 apparatus. Withdraw the cork, light the candle, and reinsert the cork. After the candle has burnt for a few minutes, blow out the flame, and when the apparatus is cool make another weighing. It will be found that the apparatus has increased in Fig. 65.—The tubes suspended from each arm of the balance contain caustic soda. When the candle in the left-hand pan burns, the sub- stances formed are absorbed by the caustic soda aoove it, and their mass is seen to be greater than that of the candle used. A s
. Elementary physics and chemistry: second stage. Science. THE BURNING OF A CANDLE. 117 apparatus. Withdraw the cork, light the candle, and reinsert the cork. After the candle has burnt for a few minutes, blow out the flame, and when the apparatus is cool make another weighing. It will be found that the apparatus has increased in Fig. 65.—The tubes suspended from each arm of the balance contain caustic soda. When the candle in the left-hand pan burns, the sub- stances formed are absorbed by the caustic soda aoove it, and their mass is seen to be greater than that of the candle used. A second method.—On each arm of a balance, as shown in Fig. 65, hang similar wide tubes containing caustic soda, the mass of each of which is the same. The caustic soda is pre- vented from falling out by coarse wire gauze at the bottom of the tubes. On the right-hand pan of the balance place a flat cork upon which a candle is fixed, so that the candle is immediately under the wide tube. Counterpoise the candle by means of nails or metal foil. Now light the candle and allow it to bum for five minutes. Notice that the balance is no longer counterpoised. The candle side is the heavier. REASONS AND RESULTS. Nothing is lost when a candle burns.—You have seen that when iron rusts, or, as you know, when it takes out the active. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gregory, R. A; Simmons, A. T. London: MacMillan
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