Air Flow Measurement

[kleenair at ix.netcom.com]

Anthony Tsakiris wrote:
> 
> >       Specifically, I am wondering if anyone has looked into using a
> differential-pressure manometer to calculate air flow.  This manometer
> could be located in the same location as GM puts its heated-wire
> mass-air-flow sensor.  Any thoughts/comments?
> 
> >(FYI - Air flow could be calculated from a differential pressure manometer
> by measuring air pressure in an appropriately sized (perhaps 4 inch dia.)
> venturi located before the throttle plates.  Air velocity through the
> venturi throat is related to the difference in pressure between the venturi
> throat and the pressure before the venturi.  Air velocity is thus used
> (along with air temperature) to determine total air mass flowing into the
> intake system.)
> 
> You still need a measure of density to determine mass flow rate, even
> if you know the
> 
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> end

Can someone guide me to descramble this?