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  2. Useful conversions and formulas for air dispersion modeling

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

    Although ppmv and grains per dscf have been used in the above examples, concentrations such as ppbv (i.e., parts per billion by volume), volume percent, grams per dscm and many others may also be used. 1 percent by volume = 10,000 ppmv (i.e., parts per million by volume).

  3. 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.

  4. Parts-per notation - Wikipedia

    en.wikipedia.org/wiki/Parts-per_notation

    At 1 ppm the solution is a very pale yellow. As the concentration increases the colour becomes a more vibrant yellow, then orange, with the final 10,000 ppm a deep red colour. In science and engineering , the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities , e.g. mole fraction or ...

  5. Carbon dioxide in Earth's atmosphere - Wikipedia

    en.wikipedia.org/wiki/Carbon_dioxide_in_Earth's...

    The concentrations of carbon dioxide in the atmosphere are expressed as parts per million by volume (abbreviated as ppmv, or ppm(v), or just ppm). To convert from the usual ppmv units to ppm mass (abbreviated as ppmm, or ppm(m)), multiply by the ratio of the molar mass of CO 2 to that of air, i.e. times 1.52 (44.01 divided by 28.96).

  6. 5 ways to tell if you’re on track for retirement — and 5 ...

    www.aol.com/finance/5-ways-tell-track-retirement...

    3. Use an online retirement calculator. Now it’s time to zoom in a little. To get a clearer snapshot of your progress, use an online retirement calculator.

  7. Red food dye could soon be banned as FDA reviews petition ...

    www.aol.com/red-food-dye-could-soon-181649897.html

    A widely used artificial food dye could soon be outlawed. The U.S. Food and Drug Administration (FDA) is moving to ban an artificial food coloring called Red No. 3, also known as Erythrosine. The ...

  8. We Ranked Costco’s Thanksgiving Pies From Worst to Best - AOL

    www.aol.com/ranked-costco-thanksgiving-pies...

    3. Kirkland Signature Pumpkin Pie. This single-crust pumpkin pie was undeniably the steal of the bunch, at just $5.99 for 68 ounces. (If you’re feeding 12 people, that’s a little over 50 cents ...

  9. Talk:Parts-per notation - Wikipedia

    en.wikipedia.org/wiki/Talk:Parts-per_notation

    For example, measuring 380 ppm CO2 in air is the equivalent of 380 molecules CO2 per 1,000,000 molecules of air. All atmospheric measurements of gases are reported with this ppmv convention and are known as mixing ratio, to distinguish from concentration, which is typically mol / volume or molecules / cc.