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I believe the formula for this is speed=Pressure/resistance

The smaller the 'pipe' the greater the resistance, thus you must increase the pressure to get the same airspeed.


It's actually more complicated, but this is the basic model.
 

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Ohm's law. It gets more complicated because losses are different in different pipes and the output in watts (actually milliwatts) is different for different instruments.

Toby
Yep.

I believe that the resistance variable is really impedence in our scenario, too.
 
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