Question

Zeer is a pot-in-pot refrigerator used in the desert climate of Egypt. A small earthen pot is kept inside a larger pot. The larger pot is filled with wet sand which, over time, cools the smaller earthen pot inside. How does cooling occur in this product?

• A. Coolant induced cooling
• B. Evaporative cooling
• C. Pressure cooling
• D. Sandblast cooling

Hint:

Evaporative cooling works by using the energy needed for water to evaporate, thus cooling the surrounding air or objects.

Answer 1

The Correct Option is B

Step 1: Understanding the Zeer.
The Zeer is a traditional cooling device that relies on the principle of evaporative cooling. The wet sand around the inner pot facilitates the evaporation of water, which absorbs heat and cools the inner pot.
Step 2: Conclusion.
Thus, the cooling in this product occurs due to evaporative cooling, where water evaporation from the sand absorbs heat.
\[ \boxed{\text{The correct answer is (b) Evaporative cooling.}} \]