Sorption Isotherms l Plots interrelating water content of a food with its water activity at constant temperature l The curve is established using a microclimate method – Gas-tight jars where RH is fixed with saturated salt solutions l Usefulness – Concentration and Dehydration processes l ease or difficulty of water removal – Assessing stability (shelf-life) of the food – Prevent caking and sticking of food powders – Determine moisture barrier properties of packaging materials – Formulation of food mixturesSorption Isotherms l Plots interrelating water content of a food with its water activity at constant temperature l The curve is established using a microclimate method – Gas-tight jars where RH is fixed with saturated salt solutions l Usefulness – Concentration and Dehydration processes l ease or difficulty of water removal – Assessing stability (shelf-life) of the food – Prevent caking and sticking of food powders – Determine moisture barrier properties of packaging materials – Formulation of food mixtures