In article , Roger Head says...

Hmmm, well.... CFM is volume/min, and per-se is not related to mass
flow. SCFM, on the other hand, indirectly specifies a mass flow because
the air is at STP.

Other gasses are also specified in SCFM.
It doesn't have to be air. You would have different
mass flows for one scfm of, say, hydrogen vs the
same scfm of xenon.

Jim

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