than the specific behaviour of the water or Water Activity. Water activity is related to water content in a non-linear relationship which is represented using as a moisture sorption isotherm curve. 3.2 ater Activity (a W. w) This is the most important parameter . of water in terms of food safety. Water activity or aw is the partial vapor pressure The results are correlated to water activity in the sample. Additional Information: Water activity has little, if any, relationship to the total moisture content of the food. Water activity does provide a means of assessing the storability and bacterial susceptibility of shelf-stable foods.

In this lesson, students will learn about the water cycle and how energy from the sun and the force of gravity drive this cycle. This website, presented by NASA’s Global Precipitation Measurement (GPM) mission, provides students and educators with resources to learn about Earth’s water cycle, weather and climate, and the technology and societal applications of studying them. Walking Water Activity – We are always on the lookout for simple science activities to do with our kids. It doesn’t get any easier than this walking water science activity! Kids of all ages will be dazzled by the magic of watching colored water move along a paper towel from a full glass to fill up an empty glass.