Does anybody know what units are in for air density in this formula
    if V is in feet per second. I'll settle for the metric units.

    I think it is in pounds per cubic inch which
    is .000046676 under standard conditions.


    Paul Lamar ...No rotor no motor.

 Paul,
The small p is density (rho). p = P/RT
Matt


Yes but what are the units? Pounds per cubic inch? Pounds per cubic foot?
etc. etc.


I suspect it is pounds per cubic inch if V is in feet per second.

Here is what I get if it is in pounds per cubic inch and V is in feet per second.