How the Freeze Dryer Works: Freezing and Sublimation

What happens here

The hosts explain the fundamental operating principle of the freeze dryer. Food is first frozen to -40 degrees (Fahrenheit/Celsius, as -40 is the same point on both scales). Once frozen, a vacuum pump is activated, creating a vacuum inside the chamber. The frozen water (ice) in the food then undergoes sublimation, directly turning from a solid into water vapor without passing through a liquid state. This vapor is then frozen onto cold coils on the chamber walls, effectively removing moisture from the food while preserving its nutrients and structure. The machine is computer-controlled, can connect to Wi-Fi, and sends alerts to a phone app.

Goal: Comprehend the scientific process of freeze-drying (freezing, vacuum, and sublimation).