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What is the difference between CFM and SCFM?

April 26, 2017difference scfm

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What is the difference between CFM and SCFM?

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CFM is air at pressure. SCFM is air at standard conditions (14.7 PSIA, 68ºF, 36% RH).

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SCFM = Standard Cubic Feet per Minute. This is 1 cubic foot of free air at standard atmospheric temperature and pressure (the standard conditions are usually 68°F and 14.7 PSIA). CFM = Cubic Feet per Minute. This is sometimes incorrectly used interchangeably with SCFM meaning free air. Unless the pressure and temperature are specified with CFM, the actual volume of gas flow cannot be determined.