FOOD CHEMISTRY
BASIC PRINCIPLES OF CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -Explanation: When there is an equilibrium between the vapor pressure and the percentage relative humidity, water activity is directly proportional to the percentage relative humidity. Even a water activity as high as 0.85 for food items is considered to be very dry for substances.
Detailed explanation-2: -Determining Moisture Sorption Isotherms The relationship between moisture content and water activity of a product is described by its moisture sorption isotherms-curves relating them to each other at specific temperatures.
Detailed explanation-3: -Water activity is directly proportionate to water/ moisture content.
Detailed explanation-4: -Water activity is equal to equilibrium relative humidity divided by 100: (a w = ERH/100) where ERH is the equilibrium relative humidity (%).