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Noun
1. water activityChemistry
Wikipedia definition
2. Water activityWater activity or aw was developed to account for the intensity with which water associates with various non-aqueous constituents and solids. Simply stated, it is a measure of the energy status of the water in a system. It is defined as the vapor pressure of a liquid divided by that of pure water at the same temperature; therefore, pure distilled water has a water activity of exactly one.
Read “Water activity” on English Wikipedia
Read “水分活性” on Japanese Wikipedia
Read “Water activity” on DBpedia

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