Question

In freeze drying, removal of moisture is due to:

• A. \(\text{Boiling}\)
• B. \(\text{Condensation}\)
• C. \(\text{Sublimation}\)
• D. \(\text{Pressure reduction}\)

Hint:

Sublimation in freeze-drying preserves food by removing moisture while retaining nutrients and structure.

Answer 1

The Correct Option is C

Step 1: Understanding freeze-drying. - Freeze-drying, or lyophilization, is a process that removes moisture by sublimation, where ice turns directly into vapor without passing through the liquid phase.
Step 2: Explanation of incorrect options.
- Boiling (A): Involves turning liquid into vapor with heat, not used in freeze-drying.
- Condensation (B): The process of vapor turning back into liquid, the opposite of freeze-drying.
- Pressure reduction (D): Reduces freezing point but does not directly cause moisture removal.
Step 3: Selecting the correct option. Since sublimation is the main mechanism for moisture removal in freeze-drying, the correct answer is (C) Sublimation.