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Water activity is related to equilibrium relative humidity by

  • A.aw = ERH
  • B.aw = ERH / 100
  • C.aw = ERH x 100
  • D.aw = 100 - ERH

Answer: B

Equilibrium relative humidity is expressed as a percentage and water activity as a decimal, so dividing by 100 converts between them. A food in equilibrium with air at 85 per cent relative humidity therefore has a water activity of 0.85.

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