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SYSTEM
While the sorption isotherm is often used to infer water activity from moisture content,
one could easily go the other direction and infer moisture content from water activity.
This is particularly attractive because water activity can be measured much more quickly
than moisture content. This method gives particularly good precision in the center of the
isotherm. In order to infer moisture content from water activity, an isotherm for the particular
product is needed. METER sells an isotherm generator called the AQUALAB Vapor Sorption
Analyzer (VSA) or METER can run the isotherm for a fee. Visit metergroup.com/food/services/
water-activity-and-isotherm-testing or contact Customer Support for more information.
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