Superheated Steam

Physics

Scientific paper

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Scientific paper

LORD RAYLEIGH (p. 438) rebuts my objection to the statement regarding the efficiency of a vapour-engine in which pure water is replaced by a saline solution, pointing out ``that Maxwell's exposition of Carnot's engine applies without the change of a single word, whether the substance in the cylinder be water, mercury, or an aqueous solution of chloride of calcium.'' The latter italics are mine. In the statement objected to by me the aqueous solution of chloride of calcium was in the boiler, and what was in the cylinder was superheated steam, which is not included in the above list, so that the application of Maxwell's exposition is somewhat difficult. The greater part of the fresh water supplied to passengers in steamships is now produced by condensing the superheated vapour of a saline solution, and the culinary experience is that the substance which was in solution has all been left in the boiler. My contention, therefore, still stands-the saline mixture is not the working substance, and Carnot's law refers to the working substance only, and not to anything left in the boiler.

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