Domestic Science. a book for Use in Schools And for General Reading

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of the burnmg candle.
The hydrogen and the carbon of wood and coal unite with the oxygen of the air, and in so doing they evolve a large and measurable quantity of heat. Fuels are etticient in proportion to the amount of hydrogen and carbon they contain. All natural fuels, however, con- tain a considerable quantity of incombustible matter ; the solid portions in the form of ash remain after the burniiia'.
PRODUCTION OF HEAT. 113 Another cause of diminution in the heating- vahie of fuels lies in
... the amount of water contained by them.
"We all know that green woods, rich in sap, are far less eflScient fuels than are dry woods. Water in fuels lowers the percentage of available hydrogen and car- bon ; its presence retards the combustive process, by absorbing much heat as the burning proceeds ; and when the boiling temperature is reached, the water is converted into steam, and thus a large amount of heat is rendered latent, and is carried off by the escaping vapor.
Woods may be ranged in the following order with respect to their heating powers, the poor kinds being named first: White pine, poplar, soft maple, cherry,/- cedar, elm, hard maple, walnut, beech, apple, ash, white oak, hickory.


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