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From Wikipedia, the free encyclopedia. Vapor density is the density of a vapour in relation to that of hydrogen. It may be defined as mass of a certain volume of a substance divided by mass of same volume of hydrogen. vapor density = mass of n molecules of gas / mass of n molecules of hydrogen. Therefore: vapour density = molar mass of gas / molar mass of H 2.
Density of (Gas) In commercial applications where air is the gas, its density is at 70Âº Fahrenheit and 29.92 inches of mercury (barometric pressure), and the. airflow is not compressed (under 10 IN w.c.), the formula reduces to: Air Velocity (FPM) = 4005 x Velocity Pressure (IN w.c.)