What term refers to the measurement of the availability of free water in food for microbial growth and chemical reactions, expressed on a scale from 0 to 1?
Water activity
Water activity is a specific measurement, expressed on a scale from 0 to 1, that indicates how much of the water in a food is actually free and available to support microbial growth and chemical reactions.
This is distinct from moisture content, which simply measures the total amount of water present in food regardless of whether it is chemically bound or free.
Relative humidity measures water vapour in air, and food hydration is not a standard technical measurement term, so neither matches this specific definition.
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