. Elementary physics and chemistry: second stage. Science. 114 ELEMENTARY PHYSICS AND CHEMISTRY. volume of water which just fills it. Find also the volume required to fill it to the edge of the gummed paper. Subtract this volume from the preceding one, and thus obtain the volume of air used. REASONS AND RESULTS. The burning of a candle.âYou have now learnt several facts about the burning of phosphorus in air, and it will be desirable before proceeding farther to study the burn- ing of some more common combustible substance, such, for instance, as a candle. In what respects is the burning of a
. Elementary physics and chemistry: second stage. Science. 114 ELEMENTARY PHYSICS AND CHEMISTRY. volume of water which just fills it. Find also the volume required to fill it to the edge of the gummed paper. Subtract this volume from the preceding one, and thus obtain the volume of air used. REASONS AND RESULTS. The burning of a candle.âYou have now learnt several facts about the burning of phosphorus in air, and it will be desirable before proceeding farther to study the burn- ing of some more common combustible substance, such, for instance, as a candle. In what respects is the burning of a candle similar to the burning of phosphorus and does it differ from it in any way ? You have already learnt when studying ventilation (p. 84), that a candle will not continue to burn very long in an enclosed quantity of air. Unless the air is renewed T- ^ nr ⢠, ⢠in some way the candle goes out. This Fig. 63.âMoisture is _ â ' . p . formed when a candle gives US a Convenient starting-point for the inquiry. Why does the candle go out, and what changes take place when the candle is burning? Water is formed when a candle burns.âWhen a clear glass bottle, which has been carefully dried inside and out, is held over a burning candle, it is soon noticed that drops of hquid be^in to collect on the inside of the bottle and after a time they ruH down the sides. In some way or other, then, the burning of the candle causes a liquid to be produced. If a sufficient quantity of this liquid is collected, it can be proved to be water by tasting it, or by determining its density, or its boiling and freezing points. Water is the only liquid which boils at 100" C. and freezes at 0° C. Another substance besides water is formed when a candle burns. âIf a candle is burnt in a clear glass bottle in the way shown in Fig. 61, the gas which is left behind can easily be examined. Experiments with this gas show that, hke the inactive part of the air, it will not allow things to burn it.
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