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Water Activity in Foods; Definition, Importance and Effects (Detailed Explanation)

By definition, water activity in foods is the ratio of the vapor pressure of the water in the food to the vapor pressure of pure water at the same temperature and its symbol is aw. Theoretically, the water activity value is between 0 and 1; however, water activity in foods varies between 0.1 and 0.99. Water activity has no units because it expresses a ratio.…