If water activity decreases, micro-organisms with the ability to grow will also decrease. It determines the ability of micro-organisms to grow. Water activity is a measurement of the availability of water for biological reactions. Mw = moisture content on a wet per cent basis It is usually expressed as a percentage of the total weight: Water content, or moisture content, is a measurement of the total water contained in a food. Available water can support the growth of bacteria, yeast and mould, which can affect the safety and quality of food.
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