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2. Picometre - Wikipedia

   en.wikipedia.org/wiki/Picometre

   The picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the International System of Units (SI), equal to 1 × 10 −12 m, or one trillionth (⁠ 1 / 1 000 000 000 000 ⁠) of a metre, which is the SI base unit of length.

3. Useful conversions and formulas for air dispersion modeling

   en.wikipedia.org/wiki/Useful_conversions_and...

   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]

4. NowCast (air quality index) - Wikipedia

   en.wikipedia.org/wiki/NowCast_(air_quality_index)

   PM 2.5 AQI of US monitors, calculated utilizing NowCast, courtesy US EPA PM2.5 AQI map, calculated utilizing NowCast, courtesy US EPA. The PM (particulate matter) NowCast is a weighted average of hourly air monitoring data used by the United States Environmental Protection Agency (USEPA) for real-time reporting of the Air Quality Index (AQI) for PM (PM 10 - particles less than 10 micrometers ...

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7. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   The picometre (SI symbol: pm) is a unit of length in the metric system equal to 10 −12 metres (⁠ 1 / 1 000 000 000 000 ⁠ m = 0. 000 000 000 001 m). To help compare different orders of magnitude this section lists lengths between 10 −12 and 10 −11 m (1 pm and 10 pm). 1 pm – distance between atomic nuclei in a white dwarf [citation ...

8. List of conversion factors - Wikipedia

   en.wikipedia.org/wiki/List_of_conversion_factors

   ≡ 185.2 m cable length (US) ≡ 720 ft = 219.456 m chain (Gunter's; Surveyor's) ch ≡ 66 ft (US) ≡ 4 rods [3] ≈ 20.116 84 m: cubit (H) ≡ Distance from fingers to elbow ≈ 18 in ≈ 0.5 m ell (H) ell ≡ 45 in [4] (In England usually) = 1.143 m fathom: ftm ≡ 6 ft [4] = 1.8288 m femtometre: fm ≡ 1 × 10 −15 m: ≡ 1 × 10 −15 m ...

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   AOL Mail welcomes Verizon customers to our safe and delightful email experience!