A text-book on chemistryFor the use of schools and colleges . essary; the 142° degrees of latent heat haveto be disposed of; this, therefore, serves to procrasti-nate the approach of winter, and causes the spring tocome on more slowly. If two pieces of ice at 32°, with moistened surfaces,are placed in contact, they freeze to one another. Thisphenomenon is called regelation, and will occur, thoughthe air may be at 90°, or the ice be in water of thattemperature. In the same way, flannel, hair, or cottonwill freeze to ice, though the metals will not. By plac-ing fragments of ice in wpoden moulds,
A text-book on chemistryFor the use of schools and colleges . essary; the 142° degrees of latent heat haveto be disposed of; this, therefore, serves to procrasti-nate the approach of winter, and causes the spring tocome on more slowly. If two pieces of ice at 32°, with moistened surfaces,are placed in contact, they freeze to one another. Thisphenomenon is called regelation, and will occur, thoughthe air may be at 90°, or the ice be in water of thattemperature. In the same way, flannel, hair, or cottonwill freeze to ice, though the metals will not. By plac-ing fragments of ice in wpoden moulds, as in Fig. 27,C D, H P, and applying a severe pressure, spheres, asB, cups, lenses, etc., may be formed. The cause of therefreezing has not been ascertained up to the explains the original formation of glaciersfrom damp snow, and accounts for their motions and Describe Moussons experiment. Is the melting of ice a fixedpoint ? What effect has the latent heat of water on the seasons ?What is meant by regelation ? REGELATION. Fig. 27. 45. changes of form in descending to the valleys below. Itavoids the necessity of supposing that the ice is a vis-cous body. Second Change of Form.—Heat of Elasticity. Exposed to a rise of temperature, liquid substancesboil at a particular point, which varies with their nature. Table of Boiling Points. Sulphuro us Acid .. 17° Ether 95° Bisulphide of 118° Bromine 145° Alcohol 173° Water 212° Acetic Acid (. 243° Nitric-Acid 248° Oil of Turpentine 314° Phosphorus 554° Sulphuric Acid. 640° Mercury 662° A technical distinction is made between a gas and avapor. By the latter we understand a gas which will Fig. 28. readily take on the liquid form. Some of the leading peculiarities inthe constitution of vapors may be ex-hibited by the following experiment:take a glass tube, a a, Fig* 28, with abulb, 6, blown on its upper extremity;pour water into the bulb, filling the tubeto within an inch or two of the end ; th
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