enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. 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 ...

  3. Air pollutant concentrations - Wikipedia

    en.wikipedia.org/wiki/Air_pollutant_concentrations

    mol = gram mole and kmol = 1000 gram moles; Pollution regulations in the United States typically reference their pollutant limits to an ambient temperature of 20 to 25 °C as noted above. In most other nations, the reference ambient temperature for pollutant limits may be 0 °C or other values.

  4. Nile blue - Wikipedia

    en.wikipedia.org/wiki/Nile_blue

    Concentrations, left to right: 1000 ppm, 100 ppm, 10 ppm, 1 ppm, 100 ppb. Nile blue in water. Left to right: pH 0, pH 4, pH 7, pH 10, pH 14. Nile blue in water (lower phase) and ethyl acetate (upper phase) in daylight.

  5. Per mille - Wikipedia

    en.wikipedia.org/wiki/Per_mille

    Visualisation of 1%, 1‰, 1‱, 1 pcm and 1 ppm as fractions of the large block . Percentage point difference of 1 part in 100; Percentage (%) 1 part in 100; Basis point (bp) difference of 1 part in 10,000; Permyriad (‱) 1 part in 10,000; Per cent mille (pcm) 1 part in 100,000

  6. 1,4-Dioxane - Wikipedia

    en.wikipedia.org/wiki/1,4-Dioxane

    1000–3000 ppm (guinea pig, 3 hr) 12,022 ppm (cat, 7 hr) 2085 ppm (mouse, 8 hr) [2] ... ranging in concentration from 2 ppb to over 11,000 ppb. Thirty of these sites ...

  7. Remediation of per- and polyfluoroalkyl substances - Wikipedia

    en.wikipedia.org/wiki/Remediation_of_per-_and...

    They often occur as extremely dilute (ppm to ppb) solutions. [1] These factors - resilience and diluteness - make remediation extremely challenging. Nonetheless, diverse methods are being tested including sonolysis , electrochemical oxidation , advanced oxidation processes , as well as the use of oxidative enzymes (such as peroxidase and ...

  8. A top Fed official leans toward December rate cut but says it ...

    www.aol.com/top-fed-official-leans-toward...

    A top Federal Reserve official said Monday that he is leaning toward supporting an interest rate cut when the Fed meets in two weeks but that evidence of persistent inflation before then could ...

  9. Mixed flowing gas testing - Wikipedia

    en.wikipedia.org/wiki/Mixed_flowing_gas_testing

    Mixed Flowing Gas (MFG) test is a laboratory test in which the temperature (°C), relative humidity (%RH), concentration of gaseous pollutants (in parts per billion, ppb or parts per million ppm level), and other critical variables (such as volume exchange rate and airflow rate) are carefully defined, monitored and controlled.