As a vapor, I would think you mean 2.5 cc/100 cc = 2.50%
Multiply both numerator and denominator by a factor to convert to any unit you wish. For example,
2.5/100 = (2.5/100) x (10/10) = 250/1000 or 250 parts per thousand.
what is 2.5% vapor expressed in parts per million?
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