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mg: milligram: 10 3 g kg: kilogram: 10 −6 g μg: microgram (mcg) 10 6 g Mg megagram 10 −9 g ng: nanogram: 10 9 g Gg gigagram 10 −12 g pg picogram 10 12 g Tg teragram 10 −15 g fg femtogram 10 15 g Pg petagram 10 −18 g ag attogram 10 18 g Eg exagram 10 −21 g zg zeptogram 10 21 g Zg zettagram 10 −24 g yg yoctogram 10 24 g Yg yottagram
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.
Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water.The quantity "1 ppm" can be used for a mass fraction if a water-borne pollutant is present at one-millionth of a gram per gram of sample solution.
Hormones predominate at the left part of the scale, shown with a red at ng/L or pmol/L, being in very low concentration. There appears to be the greatest cluster of substances in the yellow part (μg/L or nmol/L), becoming sparser in the green part (mg/L or μmol/L).
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]
Force; system unit code (alternative) symbol or abbrev. notes sample default conversion combinations SI: giganewton: GN GN 1.0 GN (220,000,000 lb f) GN LT-f. GN LT-f ST-f; GN LTf
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
10 nG: 10 −11 T: 10 pT: 100 nG "Potholes" in the magnetic field found in the heliosheath around the Solar System reported by Voyager 1 (NASA, 2006) [4] 10 −10 T 100 pT: 1 μG: Heliosphere: 10 −9 T nanotesla 1 nT: 10 μG: 10 −8 T 10 nT: 100 μG: 10 −7 T 100 nT: 1 mG: Coffeemaker (30 cm or 1 ft away) [5] 100 nT to 500 nT: 1 mG to 5 mG