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  2. 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]

  3. Orders of magnitude (mass) - Wikipedia

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

    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.

  4. Microgram - Wikipedia

    en.wikipedia.org/wiki/Microgram

    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.

  5. The 6 most common headache types — and when to see a doctor

    www.aol.com/6-most-common-headache-types...

    A headache is a pain in the head, neck or face that is often described as a sensation of pressure that varies in location, frequency and severity, according to the National Institutes of Health.

  6. Knoop hardness test - Wikipedia

    en.wikipedia.org/wiki/Knoop_hardness_test

    A pyramidal diamond point is pressed into the polished surface of the test material with a known (often 100 g) load, for a specified dwell time, and the resulting indentation is measured using a microscope. The geometry of this indenter is an extended pyramid with the length to width ratio being 7:1 and respective face angles are 172 degrees ...

  7. 34 Unique Things to Do on New Year's Eve to Ring in 2025 - AOL

    www.aol.com/25-unique-things-years-eve-204800916...

    The point is, there's no one way to celebrate New Year's Eve. So long as you're where you want to be, surrounded by those you love most, it's bound to be a wonderful finale for 2024.

  8. Thermogravimetric analysis - Wikipedia

    en.wikipedia.org/wiki/Thermogravimetric_analysis

    Thermogravimetric analysis or thermal gravimetric analysis (TGA) is a method of thermal analysis in which the mass of a sample is measured over time as the temperature changes. . This measurement provides information about physical phenomena, such as phase transitions, absorption, adsorption and desorption; as well as chemical phenomena including chemisorptions, thermal decomposition, and ...

  9. Jennifer Grey Recalls 'Smoking a Lot of Weed' Before Sex ...

    www.aol.com/lifestyle/jennifer-grey-recalls...

    Jennifer Grey looked back on how a sex scene with Patrick Swayze — that was ultimately cut from 1984’s Red Dawn — was derailed by him being drunk, and her "smoking a lot of weed" at the time ...