A text-book on chemistryFor the use of schools and colleges . nually felt by animals does notarise from a mere wish to gratify the appetite, but from What is the relation of oxygen to acid and basic bodies? Whatis the generic designation for its compounds? What are the threeclasses of compounds it yields? What is the respiratory mechanismfor ? What effect does oxygen produce in the body ? Whence doesthe desire for eating arise? FLAME. 227 the necessity of securing a fresh supply of force-produc-ing material. The terms supporter of combustion and combustibleare expressive of an erroneous idea.
A text-book on chemistryFor the use of schools and colleges . nually felt by animals does notarise from a mere wish to gratify the appetite, but from What is the relation of oxygen to acid and basic bodies? Whatis the generic designation for its compounds? What are the threeclasses of compounds it yields? What is the respiratory mechanismfor ? What effect does oxygen produce in the body ? Whence doesthe desire for eating arise? FLAME. 227 the necessity of securing a fresh supply of force-produc-ing material. The terms supporter of combustion and combustibleare expressive of an erroneous idea. No substance isintrinsically either one or the other. Hydrogen willsupport the combustion of a jet of oxygen just as wellas oxygen will that of a jet of hydrogen. In fact, bothbodies are equally engaged in producing the result, com-bustion only taking place on the mutual surface of con-tact. Oxygen has come to be regarded as the principalsupporter of combustion, because most combustions takeplace in the air, which owes its active qualities to this Fig. An ordinary flame is not incandes-cent throughout, but is a mere super-ficies or luminous shell, as may beseen on lowering a wire gauze downupon it, as in Fig. 195. In such aflame several distinct parts may betraced. Around the wick, a, , at the points i i, the light is of ablue color, for here, the air being inexcess, the combustion is perfect. From this toward cthe combustible matter predominates, and the Fig. light is most intense. A faint exterior cone,e e, surrounds the more luminous portion, butthe interior at b is totally dark. It is proba-ble that the light arises chiefly from the igni-tion of solid matter, for incandescent gases areonly faintly luminous. The hydrogen of theflame is first burned, and for a moment carbonis set free in the solid form at a very high tem-perature, its oxidation instantly ensuing. Thetemperature of the oxy-hydrogen flame is8061°, but this is surpassed in heat by theVoltaic
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