Essay On Freeze Drying

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Freeze drying, otherwise known as lyophilization, is a form of drying that is done by freezing a wet substance and allowing the ice to directly sublime to vapor by exposing it to a low-pressure amount of water vapor. This method of drying takes place in a special type of vacuum desgned for this method. Freeze drying is used in many instances, often as a means to preserve material or decrease the weight of that material; thus allowing transportation of certain substances to become less difficult.
Freeze drying has been around and successful for a long time. The freeze drying method was first seen the ancient Indian tribes. The Peruvian Incas were the approximately the first to use this clever method. They did this by leaving their food out and allowing it to set in the cold weather and freeze. Then, the Incas stamped on their food to squash out any left over water. They then left their crushed food out in the sun in order to dry it. Freeze drying was later seen in World War II. This method was used in a slightly different way than the Incas, however. The military crews in WWII used ...

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