Discussion
Which statement about hysteresis in sorption isotherms is TRUE?
Answer: B
Correct answer: Desorption lies above adsorption at a given humidity
At the same relative humidity, material that arrived by drying holds more water than material that arrived by wetting, so the desorption curve lies above the adsorption curve.
The usual explanation is capillary condensation together with structural change in the matrix: pores that fill at one humidity do not empty until a lower one is reached. The first option reverses this, the third denies hysteresis exists, and the fourth is wrong because the gap is generally widest in the mid-humidity range rather than vanishing there. The practical consequence is that an equilibrium moisture figure is incomplete without the sample's history.
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