What is Water Activity?

Water activity is expressed as aw, which is the ratio of the vapor pressure of water in food to the vapor pressure of pure water at the same temperature. It sh…

1. Food & Material Scientist reply

   Great info. Aw of 0.60, mold and yeast action occurs, and with Aw of 0.85 bacteria can act as well. Meat has a high water activity of 0.95. Interestingly corn syrup have low amoun…