This week on IAQ Radio we talk about a subject that can be as tough to pin down as water itself. What is "water activity" and why is it important? We learn the answer today with Brady Carter, Lead Research Scientist for Decagon Devices. Mr. Carter is Lead Research Scientist at Decagon Devices, Inc. He provides scientific, application, and technical support to customers. In addition, he overseas product/technology development and testing in the area of complete moisture analysis. Prior to his work at Decagon, he was an Assistant Professor/Scientist at Washington State University in Wheat Quality Research. Mr. Carter graduated Suma Cum Laude from Weber State University in 1997 with a Bachelor's degree in Botany and Chemistry and received his Master's degree in Cereal Chemistry from Washington State University in 1999. Mr. Carter has written numerous journal articles, trade journals, and application notes about water activity and its importance in determining product quality and stability. He has pioneered work on determining glass transitions using dynamic isotherms. He has given numerous presentations about water activity, moisture sorption isotherms, and complete moisture analysis at professional meetings and venues around the world.