Elements of inorganic chemistry : descriptive and qualitative . by the union of thefuel with atmospheric oxygen. Before a substance canunite with oxygen, it must be heated to what is called itsburning temperature or kindling point; and to produceflame, it must be converted into a gas. A flame is a burn-ing gas. Exp. 17 p. Carefulhy place a bent glass tube very near thewick of a lighted candle, within the flame zone. The gasescaping from the wick will be forced up through the tube, andmay be lighted at the other end of the tube. Since the gas which escapes from the wick burns onlywhen mixed wit
Elements of inorganic chemistry : descriptive and qualitative . by the union of thefuel with atmospheric oxygen. Before a substance canunite with oxygen, it must be heated to what is called itsburning temperature or kindling point; and to produceflame, it must be converted into a gas. A flame is a burn-ing gas. Exp. 17 p. Carefulhy place a bent glass tube very near thewick of a lighted candle, within the flame zone. The gasescaping from the wick will be forced up through the tube, andmay be lighted at the other end of the tube. Since the gas which escapes from the wick burns onlywhen mixed with air, the flame of a candle has but athin outer zone, in which the gas is entirely consumed,(Fig. 1.) Explanation of Fig. 1. t, bent glass tube. c, centre of unconsumed gas. p, zone of incomplete combus-tion. f, light zone, or zone of com-plete combustion. f;, unconsumed gas burning atend of glass tube. Queries. What does this ex-periment prove % Why can younot ignite a fump of anthracitecoal with a match ? Why doesa blow-pipe give such a hotflame ? Fig.
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