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Thermodynamics
The Physics of blowing a puff of air
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[QUOTE="Drakkith, post: 6816140, member: 272035"] In the confined space of the small tunnel made by your lips, [I]all [/I]of the air is moving rapidly. But when it exits your lips it runs into stationary air and pushes it out of the way. But then this air runs into even more stationary air and pushes it away. Which runs into even more stationary air...etc etc etc. On top of this, the air that's pushed out of the way is replaced by slow moving air coming in from behind, which itself then has to be pushed out of the way by your breath. The end result is that your breath only has a small distance in which it retains any significant velocity. A similar thing happens with rocket engines. Standing directly underneath a large rocket engine would blow you away immediately (and cook you like a turkey under a blowtorch), but you can stand underneath a rocket flying high overhead and not feel even the slightest breeze. I throw in the towel when it comes to anything beyond basic calculus, of which fluid mechanics definitely is beyond. [/QUOTE]
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The Physics of blowing a puff of air
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