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QPages 96-97: Q7: HC Verma: Concepts of Physics - Volume 2 Heat Transfer Pages 96-97: Q7 Solution: An ordinary electric fan does not cool the air, still it gives…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume a fan lowers the room‑air temperature, but the fan only increases convective airflow that speeds up sweat evaporation, extracting latent heat from the skin. Emphasize that the air’s temperature remains essentially unchanged while the body loses heat through evaporation.

An ordinary electric fan does not cool the air, still it gives comfort in summer. Explain.

Step-by-Step Verified Solution

**Answer:** An electric fan does not cool the air; it cools the body by increasing evaporation of sweat. **Step-by-Step Explanation:** The fan circulates air, which increases the evaporation of sweat from the skin. Evaporation absorbs latent heat from the body, producing a cooling sensation. The air itself is not cooled; it is the enhanced evaporation that makes us feel comfortable [citation:13].

All Questions in this Chapter

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