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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. Shaboozey’s ‘Bar Song’ Breaks Hot 100 Records With a 17th ...

    www.aol.com/shaboozey-bar-song-breaks-hot...

    Nothing seems able to tip “A Bar Song (Tipsy)” from the top of the Billboard Hot 100. Shaboozey’s smash is now enjoying its 17th week at No. 1, and broke a couple of records by hitting that ...

  7. 5 types of winter squash you should start eating now - AOL

    www.aol.com/lifestyle/5-types-winter-squash...

    After a summer full of grilled zucchini and yellow squash, now is the perfect time to switch things up and cook some winter squash. So what exactly sets summer and winter squash varieties apart?

  8. College Football Playoff predictions: Projecting who would ...

    www.aol.com/college-football-playoff-predictions...

    Saturday's college football action featured upsets and wins that will shake up the College Football Playoff field ahead of its second rankings release.. Ahead of Tuesday's second Co llege Football ...

  9. Trace gas - Wikipedia

    en.wikipedia.org/wiki/Trace_gas

    Some of the sinks of trace gases are chemical reactions in the atmosphere, mainly with the OH radical, gas-to-particle conversion forming aerosols, wet deposition and dry deposition. [1] Other sinks include microbiological activity in soils. Below is a chart of several trace gases including their abundances, atmospheric lifetimes, sources, and ...