A dew point apparatus was devised for measuring the humidity over aqueous solutions of non-volatile substances. Preliminary experiments proved that results obtained with the instrument were reproducible and that it could be used to make dependable measurements of the relative humidity over such solutions in the range of from 70% to 90% at 25° C.
Dew point determinations were made on a series of glycerol solutions having aqueous tensions corresponding to from 70% to 95% relative humidity at 25° C. The experimental data are critically compared with previously published figures.
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