Question

Method of drying which works on the principle of sublimation -

• A. Drum drying
• B. Spray drying
• C. Thin layer drying
• D. Freeze drying

Hint:

Sublimation requires operating below the triple point of water.
Freeze drying (lyophilization) is the only common industrial drying method that operates under these low-temperature, low-pressure conditions.

Answer 1

The Correct Option is D