cfm --> lb/min

[MaroonRegal]

Anybody know how to convert Cubic Feet/Minute into Pounds/Minute? Obviously this isn't a perfect conversion, because of altitude and other factors that involve the number of molecules per cubic foot, but there has to be some kind of general range for a conversion factor...I just can't find it. Anybody know? Thanks.

[MaroonRegal]

Okay, PaPaPooh just pointed out to me something i already should've known. There are 14.7 pounds of air in a square inch at sea-level.

[PaPaPooh]

14.7 sea level

[MaroonRegal]

That makes 176.4 lbs per cf at sea level.

 

EDIT: Ok, that's wrong. There are 1728 inches in a cubic foot...not 12. That means there are 25,401.6 lbs/cf...that can't be right either.

 

Now I'm not sure again.

[Robby1870]

Okay, PaPaPooh just pointed out to me something i already should've known. There are 14.7 pounds of air in a square inch at sea-level.

 

There's your problem a SQUARE inch cant have any volume, so it cant have weight. And, its 14.7 pounds of force per square inch of area at sea level....that what PSI means

 

EDIT: all you need to do that conversion is the density of air in English units....I know it in Metric....but not in english

[WhiteOut]

PV=nRT

 

p= 1 atm

V= 28.3 L or 1 ft^3

n=???

R=0.8251

T=298 Kelvin or ~76*F

 

Solve for n, n=0.1151 mol air

 

MW of air =28.9 g/mol

 

3.326 g air OR 7.333e10-3 lbs. of air per cubic foot

 

Assuming my memory is correct for the gas constant that should be pretty close.

[MaroonRegal]

Thanks

[loominaz34]

http://www.convert-me.com If its not there, it doesnt exist.