Get An Introduction to the Kinetic Theory of Gases (Cambridge PDF

By James Jeans

ISBN-10: 0521092329

ISBN-13: 9780521092326

This e-book will be defined as a student's version of the author's Dynamical idea of Gases. it's written, notwithstanding, with the wishes of the scholar of physics and actual chemistry in brain, and people components of which the curiosity was once quite often mathematical were discarded. this doesn't suggest that the publication includes no severe mathematical dialogue; the dialogue specifically of the distribution legislation is kind of unique; yet commonly the math is anxious with the dialogue of specific phenomena instead of with the dialogue of basics.

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Sample text

PRESSURE IN A GAS 55 for an ideal gas; for real gases they will be true to within varying degrees of closeness, the accuracy of the approximation depending on the extent to which the gas approaches the state of an ideal gas. The method of evaluating the pressure which has been given in § 33 in no way requires that the medium should be gaseous, although the resulting laws of Dalton, Boyle and Charles are usually thought of only in relation to gases. Clearly, however, these laws must apply to any substance with a degree of approximation which will depend only on the nearness to the truth of the assumptions just referred to.

Thus molecular velocities of 11 kilometres per second are excessively rare, but are not non-existent. Of the molecules in the outermost layer of the atmosphere, a certain small proportion must always have velocities in excess of this. These molecules in effect constitute projectiles which will pass off into space never to return. For this reason, the earth is continually losing its atmosphere, although at an excessively slow rate. The molecules which are most likely to attain speeds of 11 kilometres a second are those of smallest weight, for these have the highest average velocity.

Returning to our cubical vessel of volume lz, let us suppose that one of its faces can slide in and out, like a piston in a cylinder, so that we can change the volume of the vessel. At first let it be of volume P, as before, and contain N molecules of average • W. Thomson, Proc, Camb. Phil. Soc. (1848) and Trans. Roy. Soc. Edinburgh (1854). 27 A PRELIMINARY SURVEY kinetic energy E, each molecule being a hard elastic sphere of infinitesimal size. Now suppose that a small quantity of energy is added, in the form of heat, to the gas in the cylinder.

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An Introduction to the Kinetic Theory of Gases (Cambridge Science Classics) by James Jeans


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