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  2. Light intensity - Wikipedia

    en.wikipedia.org/wiki/Light_intensity

    Irradiance, a radiometric quantity, measured in watts per square meter (W/m 2) Intensity (physics) , the name for irradiance used in other branches of physics (W/m 2 ) Radiance , commonly called "intensity" in astronomy and astrophysics (W·sr −1 ·m −2 )

  3. Sheet resistance - Wikipedia

    en.wikipedia.org/wiki/Sheet_resistance

    Sheet resistance is a special case of resistivity for a uniform sheet thickness. Commonly, resistivity (also known as bulk resistivity, specific electrical resistivity, or volume resistivity) is in units of Ω·m, which is more completely stated in units of Ω·m 2 /m (Ω·area/length).

  4. Candela per square metre - Wikipedia

    en.wikipedia.org/wiki/Candela_per_square_metre

    The candela per square metre (symbol: cd/m 2) is the unit of luminance in the International System of Units (SI). The unit is based on the candela, the SI unit of luminous intensity, and the square metre, the SI unit of area.

  5. Area density - Wikipedia

    en.wikipedia.org/wiki/Area_density

    The body mass index is expressed in units of kilograms per square meter, though the area figure is nominal, being the square of the height. The total electron content in the ionosphere is a quantity of type columnar number density. Snow water equivalent is a quantity of type columnar mass density.

  6. Molar absorption coefficient - Wikipedia

    en.wikipedia.org/wiki/Molar_absorption_coefficient

    In chemistry, the molar absorption coefficient or molar attenuation coefficient (ε) [1] is a measurement of how strongly a chemical species absorbs, and thereby attenuates, light at a given wavelength.

  7. Solar irradiance - Wikipedia

    en.wikipedia.org/wiki/Solar_irradiance

    Global Map of Global Horizontal Radiation [5] Global Map of Direct Normal Radiation [5]. There are several measured types of solar irradiance. Total solar irradiance (TSI) is a measure of the solar power over all wavelengths per unit area incident on the Earth's upper atmosphere.

  8. Barn (unit) - Wikipedia

    en.wikipedia.org/wiki/Barn_(unit)

    A barn (symbol: b) is a metric unit of area equal to 10 −28 m 2 (100 fm 2).This is equivalent to a square that is 10 −14 m (10 fm) each side, or a circle of diameter approximately 1.128 × 10 −14 m (11.28 fm).

  9. Square metre - Wikipedia

    en.wikipedia.org/wiki/Square_metre

    The square metre (international spelling as used by the International Bureau of Weights and Measures) or square meter (American spelling) is the unit of area in the International System of Units (SI) with symbol m 2. [1]