Discussion
Which one of the following statements regarding moisture sorption isotherms of a dried food is NOT correct?
Answer: B
The statement that is NOT correct is an adsorption isotherm exhibits higher equilibrium moisture content than a desorption isotherm in hysteresis.
In sorption hysteresis it is the other way round: at the same temperature and water activity, the desorption isotherm lies above the adsorption isotherm, so a food being dried holds more water than the same food rewetted to that activity.
The other statements are correct. The gap between the two curves is what hysteresis means; at constant moisture content, the temperature dependence of water activity follows the Clausius-Clapeyron equation through the isosteric heat of sorption; and the GAB equation is a three-parameter multilayer model extending BET.
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