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  2. Drinking water quality standards - Wikipedia

    en.wikipedia.org/wiki/Drinking_water_quality...

    Drinking water standards include lists of parametric values, and also specify the sampling location, sampling methods, sampling frequency, analytical methods, and laboratory accreditation ( AQC ). In addition, a number of standards documents also require calculation to determine whether a level exceeds the standard, such as taking an average.

  3. Electrolysis of water - Wikipedia

    en.wikipedia.org/wiki/Electrolysis_of_water

    Thermodynamics. [edit] The electrolysis of water in standard conditions requires a theoretical minimum of 237 kJ of electrical energy input to dissociate each mole of water, which is the standard Gibbs free energyof formation of water. It also requires thermal energy to balance the change in entropy of the reaction.

  4. United States one-dollar bill - Wikipedia

    en.wikipedia.org/wiki/United_States_one-dollar_bill

    The United States one-dollar bill ( US$1 ), sometimes referred to as a single, has been the lowest value denomination of United States paper currency since the discontinuation of U.S. fractional currency notes in 1876. An image of the first U.S. president (1789–1797), George Washington, based on the Athenaeum Portrait, a 1796 painting by ...

  5. Pressurized heavy-water reactor - Wikipedia

    en.wikipedia.org/wiki/Pressurized_heavy-water...

    A pressurized heavy-water reactor ( PHWR) is a nuclear reactor that uses heavy water ( deuterium oxide D 2 O) as its coolant and neutron moderator. [ 1] PHWRs frequently use natural uranium as fuel, but sometimes also use very low enriched uranium. The heavy water coolant is kept under pressure to avoid boiling, allowing it to reach higher ...

  6. Water–gas shift reaction - Wikipedia

    en.wikipedia.org/wiki/Water–gas_shift_reaction

    The water–gas shift reaction (WGSR) describes the reaction of carbon monoxide and water vapor to form carbon dioxide and hydrogen : CO + H 2 O ⇌ CO 2 + H 2. The water gas shift reaction was discovered by Italian physicist Felice Fontana in 1780. It was not until much later that the industrial value of this reaction was realized.

  7. 1 - Wikipedia

    en.wikipedia.org/wiki/1

    1 ( one, unit, unity) is a number a single unit of counting or measurement. It is generally used as a standard mathematical length, for example, the unit vector is a vector of length 1. 1 is the first nonzero natural number and the first and smallest positive integer. This fundamental property has led to its unique uses in other fields, ranging ...

  8. Optical properties of water and ice - Wikipedia

    en.wikipedia.org/wiki/Optical_properties_of...

    The refractive index of water at 20 °C for visible light is 1.33. [ 1] The refractive index of normal ice is 1.31 (from List of refractive indices ). In general, an index of refraction is a complex number with real and imaginary parts, where the latter indicates the strength of absorption loss at a particular wavelength.

  9. Faraday constant - Wikipedia

    en.wikipedia.org/wiki/Faraday_constant

    9.648 533 212 331 001 84 × 104 C⋅mol−1. In physical chemistry, the Faraday constant (symbol F, sometimes stylized as ℱ) is a physical constant defined as the quotient of the total electric charge ( q) by the amount ( n) of elementary charge carriers in any given sample of matter: F = q/n; it is expressed in units of coulombs per mole (C ...

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