how does swatting your hand towards your face in a hot day provide cold breeze instead of hot air?

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Or how any fast moving object also provides cold air

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Anonymous 0 Comments

Plenty of good answers here.

Additionally, human being are actually quite bad at feeling absolute temperature. Were better at feeling changes in temperature*. Since the air close to you is slightly warmer than average because your body is emitting heat, the new air feel “cold” even though it’s a small difference.

*You can see that in action with a small at home experiment. Get 3 bowls of one water, 1 with cold water, 1 at room temperature, and 1 with warm water (Not too hot though !). You put one hand in the cold water bowl and the other in the warm water bowl. Remain there 1 or 2 minutes. Then put both hand in the room temperature bowl. The water will feel hot with one hand and cold with the other, we don’t measure absolute temperature, we feel relative temperature

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