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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
Elementary Treatise on Natural Philosophy Volume 3

Elementary Treatise on Natural Philosophy Volume 3

Privat-Deschanel, Augustin

Paperback

Fiction AnthologiesGeneral World History

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ISBN10: 1130652866
ISBN13: 9781130652864
Publisher: General Books
Pages: 78
Weight: 0.34
Height: 0.16 Width: 7.44 Depth: 9.69
Language: English
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1873 Excerpt: ...air, and partly by radiation. When the thermometer is placed in the centre of a vacuous space, radiation alone can operate, namely, radiation from the thermometer to the walls of the inclosure. The law of cooling under these conditions has been investigated experimentally by Dulong and Petit, and was reduced by them to a formula which was found to be accurate within the limits of experimental error for all the ranges of temperature employed, the excess of the temperature of the thermometer above that of the walls of the inclosure ranging from 20 to 240 C. They found that the rate of cooling did not depend upon the difference of temperature alone, but was faster at high than at low temperatures; also that, for a given temperature of the walls, the rate of cooling was not simply proportional to the excess, but increased more rapidly. Both these results are expressed by their formula V = ca'(a'-1), (3) where V denotes the rate of cooling, c and a constants, t the temperature of the walls of the inclosure, and 6 the excess of temperature, so that t + 6 is the temperature of the thermometer. If we denote this by H the formula may be thrown into the more symmetrical form V = c (a'-of), (4) which suggests the idea that an unequal exchange of heat takes place between the thermometer and the walls, the thermometer giving to the walls a quantity of heat represented by av, and receiving in exchange1 only the quantity a. The former of these amounts remains the same at all temperatures of the inclosure, and the latter is the same for all temperatures of the thermometer. When the temperatures are Centigrade, the constant a is 1-0077When they are Fahrenheit it is 10043, the form of the expression for V being unaffected by a change of the zero from which the temperatures a...

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