Search results
Results from the WOW.Com Content Network
In fractions like "2 nanometers per meter" (2 n m / m = 2 nano = 2×10 −9 = 2 ppb = 2 × 0.000 000 001), so the quotients are pure-number coefficients with positive values less than or equal to 1. When parts-per notations, including the percent symbol (%), are used in regular prose (as opposed to mathematical expressions), they are still pure ...
≡ 0.453 592 37 kg = 7000 grains ≡ 0.453 592 37 kg: pound (metric) ≡ 500 g = 500 g pound (troy) lb t ≡ 5760 grains = 0.373 241 7216 kg: quarter (imperial) ≡ 1 ⁄ 4 long cwt = 2 st = 28 lb av = 12.700 586 36 kg: quarter (informal) ≡ 1 ⁄ 4 short ton = 226.796 185 kg: quarter, long (informal) ≡ 1 ⁄ 4 long ton = 254.011 7272 kg ...
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.
In the European Union, the limit is also set at 50 micrograms per kilogram (μg/kg) in apple juice and cider, at 25 μg/kg in solid apple products, and at 10 μg/kg in products for infants and young children. These limits came into force on 1 November 2003. [18] [full citation needed]
where: 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
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 .
An overview of ranges of mass. To help compare different orders of magnitude, the following lists describe various mass levels between 10 −67 kg and 10 52 kg. The least massive thing listed here is a graviton, and the most massive thing is the observable universe.
The two alternatives are to abbreviate as "mcg" [14] [3] or to write out "microgram" in full (see also List of abbreviations used in medical prescriptions). The alternative abbreviation may be ambiguous in rare circumstances in that mcg could also be read as a micrigram , i.e. 10 −14 g; however the prefix micri is not standard, nor widely ...