@arsene2conde,
Determine the density of air at standard conditions in pound per Standard cubic foot. Standard condition are , I believe, 1 tatm pressure and 60 degF.
Hint use ideal gas law
SCFH is 325,000 (lb//hr)/Sden (lb/ft^3)
SCFM is SCFH divided by 60 (min/hr)
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Standard density is about 0.08 lb/ft^3
SCFM is then about 68,000
Rap