09 SEP 2011 by ideonexus

 An Experiment in Evaporation and Condensation finds Eleme...

Salt water when it turns into vapour becomes sweet, and the vapour does not form salt water when it condenses again. This I know by experiment. The same thing is true in every case of the kind: wine and all fluids that evaporate and condense back into a liquid state become water. They all are water modified by a certain admixture, the nature of which determines their flavour.
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From Aristotle's "Meteorology". An example of knowing something from experiment.