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  2. Lifting gas - Wikipedia

    en.wikipedia.org/wiki/Lifting_gas

    Only certain lighter than air gases are suitable as lifting gases. Dry air has a density of about 1.29 g/L (gram per liter) at standard conditions for temperature and pressure (STP) and an average molecular mass of 28.97 g/mol, [1] and so lighter-than-air gases have a density lower than this.

  3. Molar mass - Wikipedia

    en.wikipedia.org/wiki/Molar_mass

    The gram-atom is a former term for a mole of atoms, and gram-molecule for a mole of molecules. [ 7 ] Molecular weight (M.W.) (for molecular compounds) and formula weight (F.W.) (for non-molecular compounds), are older terms for what is now more correctly called the relative molar mass ( M r ). [ 8 ]

  4. Air pollutant concentrations - Wikipedia

    en.wikipedia.org/wiki/Air_pollutant_concentrations

    As an example, a measured NO x concentration of 45 ppmv in a dry gas having 5 volume % O 2 is: 45 × ( 20.9 - 3 ) ÷ ( 20.9 - 5 ) = 50.7 ppmv of NO x. when corrected to a dry gas having a specified reference O 2 content of 3 volume %. Note: The measured gas concentration C m must first be corrected to a dry basis before using the above equation.

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  6. Useful conversions and formulas for air dispersion modeling

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

    For example, such a regulation might limit the concentration of NOx to 55 ppmv in a dry combustion exhaust gas corrected to 3 volume percent O 2. As another example, a regulation might limit the concentration of particulate matter to 0.1 grain per standard cubic foot (i.e., scf) of dry exhaust gas corrected to 12 volume percent CO 2.

  7. Why Trump's plan to 'drill, baby, drill' is unlikely to cut ...

    www.aol.com/why-trumps-plan-drill-baby-100820989...

    The price of benchmark U.S. crude oil, called West Texas Intermediate, has tumbled to about $70 a barrel from $120 in June 2022, shortly after Russia’s invasion of Ukraine. In turn, average U.S ...

  8. 9 Items You Should Actually Store In The Freezer, According ...

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    How to: Wrap the bread tightly in plastic wrap, then vacuum seal or transfer it to a zip-top bag, pressing out as much air as possible. How long: You can typically store bread—homemade ...

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