Abstract
The water activity ( a w) of propylene glycol (PG) solutions in the range 2·03–8·65 g PG/100 g water is derived from the measurement of their freezing points. Resulting data follow closely Norrish's equation, a w = (1− X 2) exp (− K X 2 2), where X 2 is the molar fraction of PG and K is a constant which may be related to the structure of the solute molecule. The dimensionless parameter K has a value of 4·04 ± 0·22. Some physico-chemical aspects of water activity lowering in propylene glycol solutions are discussed.
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