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III.—On some Nuclei of Cloudy Condensation

Published online by Cambridge University Press:  06 July 2012

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
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.