Vapour Pressure of Solids at Low Temperatures (and the Origin of the Planets)


IN a letter on the origin of the solar system, in Nature of January 29, Dr. Harold Jeffreys speaks of the importance of estimating the vapour densities of ordinary solids at the hypothetical temperatures of the condensation of the planets; the problem, as he puts it, being largely whether a gas at some not very small fraction of 10-15 density can condense at 400° A.; he adds that he has not been able to find data on the subject.

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