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Water activity is defined as the ratio between

  • A.the vapour pressure of the food and that of distilled water
  • B.the mass of water and the mass of solids in the food
  • C.the volume of free water and the volume of bound water
  • D.the weight of the food before and after drying

Answer: A

Water activity compares the vapour pressure of the food itself with the vapour pressure of distilled water under identical conditions. It therefore measures how available the water is to microorganisms, which is not the same thing as how much water the food contains.

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