Skimmed milk powder is a dairy product made by evaporating skimmed milk until it is completely dry. This powder is easier to store and transport than skimmed milk in liquid form, and it is typically less expensive. Making the powder begins with pasteurizing whole milk and removing the cream to make skimmed milk. Milk is then run through a drying process until it dries to a white powder. Spray drying and drum drying are the most common evaporation methods, but freeze drying is also an option. Powdered skimmed milk is classified based on the temperatures used in the evaporation process.