Powdered milk or dried milk is a manufactured dairy product made by evaporating milk to dryness . One purpose of drying milk is to preserve it; milk powder has a far longer shelf life than liquid milk and does not need to be refigerated,
due to its low moisture content. Another purpose is to reduce its bulk
for economy of transportation. Powdered milk and dairy products include
such items as dry whole milk, nonfat (skimmed) dry milk, dry buttermilk,
dry whey products and dry dairy blends.