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A Catechism of the Steam Engine
by John Bourne
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In its Various Applications to Mines, Mills, Steam Navigation, Railways, and Agriculture. With Practical Instructions for the Manufacture and Management of Engines of Every Class.
Q.--What is meant by latent heat? A.--By latent heat is meant the heat existing in bodies which is not discoverable by the touch or by the thermometer, but which manifests its existence by producing a change of state. Heat is absorbed in the liquefaction of ice, and in the vaporization of water, yet the temperature does not rise during either process, and the heat absorbed is therefore said to become latent. The term is somewhat objectionable, as the effect proper to the absorption of heat has in each case been made visible; and it would be as reasonable to call hot water latent steam.
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