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11. Glossary
Water activity (A w )
Activity Water, hence the symbol A w .
Represents the proportion of free water in a product. It is one of the main parameters influencing the preservation of food or pharmaceutical products. The greater the amount of free water (A w high), the greater the potential for micro-organisms to thrive.
Calculated as the ratio between the water vapor pressure of a wet product and the saturation vapor pressure at the same temperature.
Appertisation
Heat treatment of a product to sterilize it.
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Flexible packaging for liquids (wine,...
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