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III.—On some Nuclei of Cloudy Condensation

Published online by Cambridge University Press:  06 July 2012

John Aitken
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Extract

I have to apologise for placing this communication before you in a somewhat incomplete form. My work has been much interrupted in the past, and it will again shortly be stopped for a considerable time. I have therefore decided to place before you the results so far as they are worked out.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 39 , Issue 1 , 1900 , pp. 15 - 25
Copyright
Copyright © Royal Society of Edinburgh 1900

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References

page 15 note * Weid. Ann., xxxii. pp. 1–19, 1887.

page 15 note † Weid. Ann., xl. pp. 161–202, 1890.

page 16 note * There is another way of considering the whole question, from which it would appear that there is no such thing as supersaturation in a vapour; that is, no strain in the vapour which either dust or “molecular shocks” can relieve. What is generally called a saturated vapour is one whose tension is equal to the tension of the vapour at a flat surface. Now this tension is not so high as the tension at a surface of extremely small convex curvature; and vapour that is in equilibrium with the vapour at a convex surface is supersaturated to the flat surface; so that saturation is a relative and not an absolute quantity, relative to the curvature of the condensing surface, and a vapour that is supersaturated to a flat surface is not necessarily saturated to a surface of very small curvature. It would thus appear that there is no strain in a vapour till a surface makes its appearance; but after it is formed the lower tension at its surface determines a movement of the vapour molecules towards it.

page 18 note * It was necessary to be constantly adding cupric sulphate to the acid in A. If this was not done, considerable condensation took place in the products.

page 21 note * Proc. Roy. Soc., Edin., vol. xx. pp. 66, 93; Trans. Roy. Soc., Edin., vol. xxxvi., Part III., pp. 621, 693.