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(mg/m3
x 24.5):MW=ppm, MW - molecular Weight24.5
is used for 20-25oC and 760 mm Hg while 22.4 is used for 0oC and 760
mm Hg. These values, 24.5 and 22.4 are simply the volume (liter) occupied by one mole
(gram/MW) of a chemical at the given temperature (25oC or 0oC) and
normal atmospheric pressure at sea level, i.e., 760 mm Hg. |