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What is the relationship between equilibrium moisture content (EMC) and free moisture content (FMC)?

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in Food Processing Unit Operations by (110k points)
What is the relationship between equilibrium moisture content (EMC) and free moisture content (FMC)?

(a) FMC=Total water content -EMC

(b) FMC=Total water content + EMC

(c) FMC=Total water content × EMC

(d) Total water content = EMC × FMC

The question was asked in final exam.

I would like to ask this question from Drying in portion Drying of Food Processing Unit Operations

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Correct answer is (a) FMC=Total water content -EMC

Easy explanation: EMC (equilibrium moisture content) of a hygroscopic substance is defined as the substance that is surrounded at least partially by air where it neither gains nor loses the moisture. FMC(free moisture content) is the amount of water that is free to evaporate from solid.

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