Frequently Asked Questions

What is the difference between water activity and moisture content?

Moisture content is a quantitative measure of water in a given product — what percent of the product by weight is water. Moisture content can be a valuable measure of yield and quality. Water activity measures the energy status of the water in the system. Water activity is most helpful for managing product quality and safety, preventing microbial growth, texture changes, shelf life, and more. For more in-depth information, see the FOOD Knowledge Base.