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It's amazing how far retailers will go in providing exaggerated/skewd/completely misleading info on these things. Due to this, I have a question:

-Is there a simple formula for working with cubic feet per minute (cfm) and PSI?

Ex: If you know that a certain compressor delivers 25 cfm @ 175 psi, would it be possible to determine what the cfm would be @ 90 psi?

...or are there other factors involved which prevent such a simple formula?

Thank you.