Which of the following statements is not correct a Aw is a r

Which of the following statements is not correct?

a.         A_w is a ratio of pressures.

b.         A_w has a maximum value of 1

c.         Moisture content is reported as part of food composition, but is not sufficient information for determining food stability.

d.         Moisture content is temperature dependent during measurement

Solution

The answer is‘d’

Moisture sorption isotherms of most food s are nonlinear, generally sigmoidal in shape, and have been classified as type II isotherms. That most of the water in fresh food exerts a vapour pressure very close to that of pure water, i.e, unity. This vapour pressure level is maintained until the moisture content of the food decreases to about 22%. The moisture level is then no loger able to sustain the vapour pressure of the food at unity.