What specific scientific process is used to freeze-dry food without damaging its structure?
Answer
Sublimation
The process of turning a solid directly into a gas, skipping the liquid phase entirely, is known as sublimation. During freeze-drying, food is frozen, and the chamber pressure is reduced while heat is applied. This causes the water to escape as a gas. Because the water does not transition through a liquid state, the cellular structure of the food remains largely intact, which allows for successful rehydration and a closer approximation of the original texture and flavor compared to traditional dehydration methods.
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