Water Activity Prediction

The water activity of a glucose-water solution (2.44:1 wt/wt) can be estimated by means of the Norrish equation. The mole fractions are: X1 = 0.804 and X2 = 0.196. The Norrish constant for glucose.is 2.25. Substituting for the values in the Norrish equation results in an estimated water activity of 0.74. log (aw/xw) = -ki(1-xw)2 ................
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