So I did a project about a year ago and I cant remember one of the things I wrote in this equation.(adsbygoogle = window.adsbygoogle || []).push({});

The equation apparently I got it from NASA's website.

https://www.grc.nasa.gov/www/k-12/airplane/dragco.html

This is my equation

CD = FL/ (0.5 * Air viscosity * V^2 * Area) = 0.4

These are the numbers I used to plug in the equation

Velocity = 13 m/s

Diameter pipe = 0.000635 m

Air viscosity = 0.00001599 kg/m*s

FL = 1*10^-9 Kg <<< this is the problem

Area of Dust = 1.96 * 10^-11 Microns

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Now in NASA's website instead of FL there's a "D" and it says the "D" represents the drag.

Now I can't remember what (FL) means, is it truly a drag? and a drag of what exactly.

My project was about compressed air moving inside a small tube, and the tube has pinched hols in it to pump the compressed air to clean a surface from dust.

SO, can someone tell mewhat the "FL" that I wrote means?andwhat exactly does the number FL = 1*10^-9 Kg represent?Could it be "air drag??" I am not sure where I found this number.

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# Drag coefficient equation

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