# Homework Help: Air speed from PSI to MPH

1. Jun 23, 2014

### Chris 23

1. The problem statement, all variables and given/known data

Air is coming out of a .002 inch gap consuming 139.2 SCFM@80PSI, what is the MPH this air is moving at and is there any loss one inch out from the face of the gap?

I am unsure of what formula to use, it has me puzzled.

2. Jun 23, 2014

### verty

You have the volumetric flow rate of the gas, you can assume the gap is circular (so the area can be calculated), so you can find the velocity of the gas, but the gas is compressed to 80 PSI so it'll exit more slowly than at the standard pressure. The task here is to integrate all this information to come up with a formula for the answer. I hope you can see how to do that now.

3. Jun 24, 2014

### Chris 23

Ok I was not sure if I had to treat the 80 PSI differently or how that factored in.

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