Discussion
The equilibrium moisture content of a product is
Answer: A
Correct answer: The moisture in balance with the air
The equilibrium moisture content is the value a product reaches when it is left long enough in air of a given temperature and relative humidity: at that point it neither gains nor loses moisture, because its vapour pressure equals that of the air.
It sets the floor for any drying operation - no dryer can take a product below the equilibrium value for its exhaust air, however long it runs. It varies with the air's relative humidity and with the material, and it is a property of the product, not of the air alone.
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