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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]
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.
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
≡ 1 ⁄ 20 g = 50 mg ... ≈ 999.972 kg/m 3 × 1 mm × g 0 ... 1 ⁄ 100 of the energy required to warm one gram of air-free water from 0 °C to 100 °C at a ...
kg f: 1.0 kg f (9.8 N; 2.2 lb f) kgf kgf kilopond: kp kp gram-force: g-f g f: 1.0 g f (9.8 mN; 0.035 oz f) gf gf pond: p p milligram-force: mg-f mg f: 1.0 ...
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In the metric system, a microgram or microgramme is a unit of mass equal to one millionth (1 × 10 −6) of a gram.The unit symbol is μg according to the International System of Units (SI); the recommended symbol in the United States and United Kingdom when communicating medical information is mcg.
Cher's mother died in December 2022 at the age of 96 after being hospitalized for pneumonia that September. The Moonstruck star revealed the sad news on X (formerly known as Twitter) at the time ...