Published equations for the sorption isotherms of hygroscopic materials cannot be used in solving the Package Life equation, but it has been found empirically that Pearson's typo XII Frequency curve can be fitted to the isotherms of many non‐crystalline commodities. Approximate solutions of the equation for the shelf‐life of water‐sensitive packages are derived. Separate equations are derived for absorption and desorption: the agreement of each with results observed in exposure trials is demonstrated.
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C. R. Oswin (1946) studied this question.
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