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Freeze drying removes water by

  • A.Evaporation at high temperature
  • B.Centrifugal separation
  • C.Absorption into a desiccant
  • D.Sublimation of ice under vacuum

Answer: D

The product is frozen and the pressure lowered below the triple point so the ice passes straight to vapour. Structure and flavour are preserved better than by any other method, at a cost that restricts it to high-value products.

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