Freeze drying Guide, Meaning , Facts, Information and Description
Freeze drying (also known as Lyophilization) is a process of removing the water from a substance in order to preserve it and avoid spoiling. It works by freezing the substance and then reducing the pressure to allow the solid water to sublimate directly from the solid phase to gas. The greatly reduced water content allows sealed products to avoid spoiling for many years, and also reduces the weight of most items because most of the water, a relatively heavy compound, has been removed. Freeze drying tends to damage the tissue being dehydrated less than other dehydration methods, which involve higher temperatures.The process has been popularized in the form of freeze dried ice cream and as an example of what food astronauts eat. It is also popular and convenient for hikers because the reduced weight allows them to carry more food and reconstitute it with available water.
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