ideal gas law
ideal gas law constant
parts per million
PV = nRTwhere P is the pressure, V is the volume, n is moles of gas, R is the ideal gas law constant (82.06 atm cm3/mol K) and T is the temperature in kelvins. Since density is mass per unit volume and the mass of the gas is moles of gas times molecular weight M,
d = g/V = M (n/V) = MP/RTFor example, at 25°C and 1.00 atm, the density of SO2 gas is approximately MP/RT = (64 g/mol)(1 atm)/(82.06 atm cm3/mol K)(298 K) = 0.00262 g/cm3 = 2620 µg/cm3.
Multiplying parts per million SO2 by volume by the density of SO2 in µg/cm3 gives you µg/m3.
Author: Fred Senese email@example.com
Copyright © 1997-2010 by Fred Senese
Comments & questions to firstname.lastname@example.org
Last Revised 08/17/15.URL: http://antoine.frostburg.edu/chem/senese/101/solutions/faq/print-converting-ppm-to-micrograms-per-cubic-meter.shtml