When.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

    For example, the conversion factor between a mass fraction of 1 ppb and a mole fraction of 1 ppb is about 4.7 for the greenhouse gas CFC-11 in air (Molar mass of CFC-11 / Mean molar mass of air = 137.368 / 28.97 = 4.74). For volume fraction, the suffix "V" or "v" is sometimes appended to the parts-per notation (e.g. ppmV, ppbv, pptv).

  3. Talk:Parts-per notation - Wikipedia

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

    The examples don't seem to be too accurate. A drop is usually defined as 0.05 ml, which then gives;. 1 drop in 50 ml = 1‰, 50ml is a very small cup 1 drop in 50 l = 1ppm 50 l is about 11 gallons, not 40 1 drop in 50 cubic metres = 1 ppb 1 drop = 1ppt, a 50 m swimming pool is 50*25*2 = 2,500 m^3 1 drop in 50,000,000 cubic metres = 1ppq, 50,000,000 m^3 is equivalent to a lake covering a square ...

  4. Grain per gallon - Wikipedia

    en.wikipedia.org/wiki/Grain_per_gallon

    Water chemists measure water impurities in parts per million (ppm). For understandability, hardness ordinarily is expressed in grains of hardness per gallon of water (gpg). The two systems can be converted mathematically.

  5. Ozone - Wikipedia

    en.wikipedia.org/wiki/Ozone

    On October 26, 2015, the EPA published a final rule with an effective date of December 28, 2015, that revised the 8-hour primary NAAQS from 0.075 ppm to 0.070 ppm. [116] The EPA has developed an air quality index (AQI) to help explain air pollution levels to the general public. Under the current standards, eight-hour average ozone mole ...

  6. Free ad-supported streaming television - Wikipedia

    en.wikipedia.org/wiki/Free_ad-supported...

    The FAST ecosystem has several layers. The best-known FASTs are the aggregators, which fall into three categories. FASTs owned by major media companies: Paramount's Pluto TV, Fox's Tubi, Charter Communications and Comcast's Xumo Play, Dish Network's Sling Freestream, ITV’s ITVX service, NEW ID's BINGE Korea, [3] Allen Media Group's Local Now, and Gray Television and National Association of ...

  7. Ultrapure water - Wikipedia

    en.wikipedia.org/wiki/Ultrapure_water

    Ultrapure water (UPW), high-purity water or highly purified water (HPW) is water that has been purified to uncommonly stringent specifications. Ultrapure water is a term commonly used in manufacturing to emphasize the fact that the water is treated to the highest levels of purity for all contaminant types, including: organic and inorganic compounds; dissolved and particulate matter; volatile ...

  8. YouTube (YouTube channel) - Wikipedia

    en.wikipedia.org/wiki/YouTube_(YouTube_channel)

    YouTube (formerly YouTube Spotlight) is the official YouTube channel for the American video-sharing platform YouTube, spotlighting videos and events on the platform. Events shown on the channel include YouTube Comedy Week and the YouTube Music Awards .

  9. PPB - Wikipedia

    en.wikipedia.org/wiki/PPB

    PPB can stand for: Production possibility boundary , a concept in economics; Parts per billion, describing small values of miscellaneous dimensionless quantities; Portland Police Bureau, in Portland, Oregon, U.S. Partido Progressista Brasileiro, former name of Progressive Party of Brazil; Pleuropulmonary blastoma, a type of lung cancer