Water Activity and Moisture Content
Water activity is related to moisture content in a non-linear relationship known as a moisture sorption isotherm curve. These isotherms are substance and temperature specific. Isotherms can be used to help predict product stability over time in different storage conditions.
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—T.S. (Thomas Stearns)
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—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)