prev next front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |review
(mg/m3 x 24.5):MW=ppm, MW - molecular Weight

24.5 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.