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Atmospheric pollutant concentrations expressed as mass per unit volume of atmospheric air (e.g., mg/m 3, μg/m 3, etc.) at sea level will decrease with increasing altitude because the atmospheric pressure decreases with increasing altitude. The change of atmospheric pressure with altitude can be obtained from this equation: [2]
At 1 ppm the solution is a very pale yellow. As the concentration increases the colour becomes a more vibrant yellow, then orange, with the final 10,000 ppm a deep red colour. In science and engineering , the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities , e.g. mole fraction or ...
mg/m 3 = milligrams of pollutant per cubic meter of air at sea level atmospheric pressure and T: ppmv = air pollutant concentration, in parts per million by volume T = ambient temperature in K = 273. + °C 0.082057338 = Universal gas constant in L atm mol −1 K −1: M = molecular mass (or molecular weight) of the air pollutant
For some usage examples, consider the conversion of 1 SCCM to kg/s of a gas of molecular weight , where is in kg/kmol. Furthermore, consider standard conditions of 101325 Pa and 273.15 K, and assume the gas is an ideal gas (i.e., Z n = 1 {\\displaystyle Z_{n}=1} ).
1107.5 mg/m 3: 250 ppm: cresol: 95-48-7: 0030: o-Cresol: 1107.5 mg/m 3: 250 ppm: cresol: 106-44-5: 0031: p-Cresol: 1107.5 mg/m 3: 250 ppm: cresol: 4170-30-3: 0241: Crotonaldehyde: 143.5 mg/m 3: 50 ppm: 123739: 98-82-8: 0170: Cumene: 4428 mg/m 3: 900 ppm: 98828 (10% Lower explosive limit LEL) 110-82-7: 0242: Cyclohexane: 4472 mg/m 3: 1300 ppm ...
200-250 mg/kg (dog, oral) [4] NIOSH (US health exposure limits): PEL (Permissible) TWA 5 ppm (22 mg/m 3) [skin] [3] REL (Recommended) Ca C 0.14 ppm (0.6 mg/m 3) [2-hr ...
455 mg/kg (rat, oral) [4] LD Lo ... (lowest published) 250 mg/kg (rabbit, oral) [4] LC 50 (median concentration) 3100 ppm (rat, 8 ... TWA 25 ppm (90 mg/m 3) [2] REL ...
However, the names of all SI mass units are based on gram, rather than on kilogram; thus 10 3 kg is a megagram (10 6 g), not a *kilokilogram. The tonne (t) is an SI-compatible unit of mass equal to a megagram (Mg), or 10 3 kg. The unit is in common use for masses above about 10 3 kg and is often used with SI prefixes.