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  2. Units of textile measurement - Wikipedia

    en.wikipedia.org/wiki/Units_of_textile_measurement

    The gram (alternative spelling: gramme; SI unit symbol: g) is a metric system unit of mass. A gram is defined as one thousandth of the SI base unit, the kilogram, or 1 × 10 −3 kg. Square metre (alternative spelling: square meter; SI unit symbol: m 2) is a superficial area equal to that of a square whose sides' lengths are each one metre.

  3. Acre - Wikipedia

    en.wikipedia.org/wiki/Acre

    1 international acre is equal to the following metric units: 0.40468564224 hectare (A square with 100 m sides has an area of 1 hectare.) 4,046.8564224 square metres (or a square with approximately 63.61 m sides) 1 United States survey acre is equal to: 0.404687261 hectare; 4,046.87261 square metres (1 square kilometre is equal to 247.105 acres)

  4. Bohr radius - Wikipedia

    en.wikipedia.org/wiki/Bohr_radius

    Since the reduced mass of the electron–proton system is a little bit smaller than the electron mass, the "reduced" Bohr radius is slightly larger than the Bohr radius (meters). This result can be generalized to other systems, such as positronium (an electron orbiting a positron ) and muonium (an electron orbiting an anti-muon ) by using the ...

  5. Electrical resistivity and conductivity - Wikipedia

    en.wikipedia.org/wiki/Electrical_resistivity_and...

    A piece of resistive material with electrical contacts on both ends. In an ideal case, cross-section and physical composition of the examined material are uniform across the sample, and the electric field and current density are both parallel and constant everywhere.

  6. Ammonia - Wikipedia

    en.wikipedia.org/wiki/Ammonia

    The standard enthalpy change of combustion, ΔH° c, expressed per mole of ammonia and with condensation of the water formed, is −382.81 kJ/mol. Dinitrogen is the thermodynamic product of combustion: all nitrogen oxides are unstable with respect to N 2 and O 2, which is the principle behind the catalytic converter.