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Mohammad Naveed on Nearpeer Intermediate (FSc) Common Room

Why does air feel warm when we breathe out with our mouth wide open, but feel cool when we blow it out through a small opening of the mouth? Can anyone answer.....? 🙏

Abeera Shahid · 2026-09-13T11:36:17.173Z

Venturi effect. You are blowing out the same volume of air either way but when you make an O shape, that air has to increase its speed to make it out the smaller opening. When you increase the air's velocity, you decrease it's pressure and temperature. And temperature is proportional to average kinetic energy.When you increase the kinetic energy of the air you rob it of some heat.so air feels cool

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