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  2. Water vapor - Wikipedia

    en.wikipedia.org/wiki/Water_vapor

    Water vapor, water vapour or aqueous vapor is the gaseous phase of water. It is one state of water within the hydrosphere. Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice. Water vapor is transparent, like most constituents of the atmosphere. [ 4] Under typical atmospheric conditions ...

  3. Diatomic molecule - Wikipedia

    en.wikipedia.org/wiki/Diatomic_molecule

    About 99% of the Earth's atmosphere is composed of two species of diatomic molecules: nitrogen (78%) and oxygen (21%). The natural abundance of hydrogen (H 2 ) in the Earth's atmosphere is only of the order of parts per million, but H 2 is the most abundant diatomic molecule in the universe.

  4. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    In mathematics, a percentage (from Latin per centum 'by a hundred') is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign (%), [ 1] although the abbreviations pct., pct, and sometimes pc are also used. [ 2] A percentage is a dimensionless number (pure number), primarily used for expressing proportions ...

  5. 78% of Americans aren't worried about COVID despite ... - AOL

    www.aol.com/lifestyle/78-americans-arent-worried...

    COVID-19 infections are on the rise in at least 35 U.S. states and territories, but that isn’t registering with most Americans. Despite a spike in COVID cases, a total of 78% of Americans ...

  6. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    In liquid form, H2O is also called "water" at standard temperature and pressure . Because Earth's environment is relatively close to water's triple point, water exists on Earth as a solid, a liquid, and a gas. [ 21 ] It forms precipitation in the form of rain and aerosols in the form of fog.

  7. Cosolvent - Wikipedia

    en.wikipedia.org/wiki/Cosolvent

    The first model and also the simplest is still in use today: the model of Yalkowsky. [7] Yalkowsky’s model utilizes the algebraic mixing rule or log-linear model: logX m = ƒ 1 logX 1 + ƒ 2 logX 2. Where X m is the mole fraction solubility of the solute, X 1 and X 2 denote the mole fraction solubility in neat cosolvent and water.

  8. Percentile - Wikipedia

    en.wikipedia.org/wiki/Percentile

    Percentile. In statistics, a k-th percentile, also known as percentile score or centile, is a score below which a given percentage k of scores in its frequency distribution falls (" exclusive " definition) or a score at or below which a given percentage falls (" inclusive " definition). Percentiles are expressed in the same unit of measurement ...

  9. Ammonia - Wikipedia

    en.wikipedia.org/wiki/Ammonia

    H2NCH2CH2OH → NH3 + CH3CHO. Ammonia is both a metabolic waste and a metabolic input throughout the biosphere. It is an important source of nitrogen for living systems. Although atmospheric nitrogen abounds (more than 75%), few living creatures are capable of using atmospheric nitrogen in its diatomic form, N2 gas.