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ART. 305 - The Dynamical Theory of Gases and of Radiation

Published online by Cambridge University Press:  05 December 2011

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Summary

In Mr Jeans' valuable work upon this subject he attacks the celebrated difficulty of reconciling the “law of equipartition of energy” with what is known respecting the specific heats of gases. Considering a gas the molecules of which radiate into empty space, he shows that in an approximately steady state the energy of vibrational modes may bear a negligible ratio to that of translational and rotational modes.

I have myself speculated in this direction; but it seems that the difficulty revives when we consider a gas, not radiating into empty space, but bounded by a perfectly reflecting enclosure. There is then nothing of the nature of dissipation; and, indeed, the only effect of the appeal to the æther is to bring in an infinitude of new modes of vibration, each of which, according to the law, should have its full share of the total energy. I cannot give the reference, but I believe that this view of the matter was somewhere expressed, or hinted, by Maxwell.

We know that the energy of æthereal vibrations, corresponding to a given volume and temperature, is not infinite or even proportional to the temperature. For some reason the higher modes fail to assert themselves. A full comprehension here would probably carry with it a solution of the specific heat difficulty.

I am glad to have elicited the very clear statement of his view which Mr Jeans gives in Nature of April 27.

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Scientific Papers , pp. 248 - 253
Publisher: Cambridge University Press
Print publication year: 2009
First published in: 1912

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