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Explain how fanning yourself cools you down.    What is the role of convection? What is the...

Explain how fanning yourself cools you down.    What is the role of convection? What is the role of latent heat?

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Answer #1

The fan cools you off by convection, one of the three modes of heat transfer (conduction, convection, and radiation).

When cool air is in contact with your body, heat is transferred from your body to the air (at a rate proportional to the temperature difference). That's conduction. If the air isn't moving, then the layer of air surrounding your body is getting warmer, causing the rate of conduction to slow down. But if the air is flowing away from your body, it's taking the heat away with it (convection), and it's being replaced by fresh cool air that's ready to absorb more heat.

If you're perspiring, then the water leaving your body is also taking heat with it, and the evaporation rate is also aided by air flow.

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