Letter | Published:

Dust-Free Spaces


Mr. Serrell is no doubt perfectly correct in his view that the average specific gravity of a warmed and vapour-filled cloud may be often less than that of air. The ascent of the so-called “steam” from a kettle proves this, and he will find the view clearly stated in Maxwell's “Heat,” p. 280. I did not enter into details in the Dublin lecture, but I was fully convinced of the truth of this statement.

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