Ratio of Free Air to Compressed Air

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Ratio of compression free air to compressed air

The ratio of compression free air to compressed air is indicated in the diagrams below.

Pressure (psi)

ratio of compression free air to compressed air - diagram in psi

1 psi = 6.9 kPa = 0.069 bar
1 ncfm = 0.5 nl/s

Example - Converting Compressed Air Volume to Free Air Volume

A compressed air volume flow of 10 acfm at 100 psig must be multiplied with aprox. 8 to find the number of cfm at atmospheric pressure.

Pressure (bar)

ratio of compression free air to compressed air - diagram in bar

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