RAPID WATER ACTIVITY DETERMINING DEVICE AND METHOD

摘要

Apparatus and method for determining the water activity (Aw) of a water-containing composition, such as a food, within approximately 10 minutes, by rapidly establishing equilibrium between the watercontaining composition and the atmosphere with which it is in contact while maintaining the temperature substantially constant and determining the dew point of this atmosphere, from which the water activity is calculable from the ratio of the partial water vapor pressure at the dew point to the vapor pressure of pure water at the temperature of the atmosphere with which the water-containing composition is in equilibrium.