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Discuss the phenomenon associated with, that air coming out of an orifice gives a cooling sensation if held close to the skin

Discuss the phenomenon associated with, that air coming out of an orifice gives a cooling sensation if held close to the skin

Grade:12th pass

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
4 years ago
Vikas TU
14149 Points
4 years ago
When you blow harder, more surrounding air gets mixed in with the stream of air from your mouth.
The faster air moves, the lower pressure it has (Bernoulli's principle). So when you blow faster, your stream of air is lower pressure than the surrounding air. Thus the surrounding air fills in the stream. The surrounding air is obviously cooler than the air in your lungs. To test this - blow fast, but put your finger right on your lip - notice it's still quite warm because other air hasn't had a chance to mix in yet.
To visual why this happens, imagine the stream of air coming from your mouth as a freeway with all red cars on it. Every on ramp to this freeway has a long line of blue cars eager to get on. If traffic is moving slow, and the red cars (air from lungs) are very close together, not a lot of blue cars (surrounding air) can get on. But if the traffic is sparse and the flow quick, you'd see more of a mix of red and blue cars.

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