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  2. Chinese units of measurement - Wikipedia

    en.wikipedia.org/wiki/Chinese_units_of_measurement

    Traditional units of length include the chi (尺), bu (步), and li (里). The precise length of these units, and the ratios between these units, has varied over time. 1 bu has consisted of either 5 or 6 chi, while 1 li has consisted of 300 or 360 bu.

  3. Planck units - Wikipedia

    en.wikipedia.org/wiki/Planck_units

    The Planck time t P is the time required for light to travel a distance of 1 Planck length in vacuum, which is a time interval of approximately 5.39 × 10 −44 s. No current physical theory can describe timescales shorter than the Planck time, such as the earliest events after the Big Bang. [ 27 ]

  4. Luminosity distance - Wikipedia

    en.wikipedia.org/wiki/Luminosity_distance

    Luminosity distance D L is defined in terms of the relationship between the absolute magnitude M and apparent magnitude m of an astronomical object. = ⁡ which gives: = + where D L is measured in parsecs.

  5. Debye length - Wikipedia

    en.wikipedia.org/wiki/Debye_length

    With each Debye length the charges are increasingly electrically screened and the electric potential decreases in magnitude by 1/e. A Debye sphere is a volume whose radius is the Debye length. Debye length is an important parameter in plasma physics, electrolytes, and colloids (DLVO theory).

  6. Japanese units of measurement - Wikipedia

    en.wikipedia.org/wiki/Japanese_units_of_measurement

    The ken is the normal unit of distance and length; the hiro used as the equivalent unit of depth. Sometimes hiro is used equal to 5 shaku [ 19 ] ( ⁠ 50 / 33 ⁠ m, ~1.5152 metres). The traditional units are still used for construction materials in Japan.

  7. Color difference - Wikipedia

    en.wikipedia.org/wiki/Color_difference

    A very simple example can be given between the two colors with RGB values (0, 64, 0) ( ) and (255, 64, 0) ( ): their distance is 255. Going from there to (255, 64, 128) ( ) is a distance of 128. When we wish to calculate distance from the first point to the third point (i.e. changing more than one of the color values), we can do this:

  8. Nepalese customary units of measurement - Wikipedia

    en.wikipedia.org/wiki/Nepalese_customary_units...

    In a nutshell, The following is a partial list of everyday units used to calculate land area in Nepal. [3] [4]1 Khetmuri = 25 Ropani; 1 Bigha (बिघा) = 20 Kattha (कठ्ठा) = 6772.63 m 2 = 72900 sq.ft. = 13.31 Ropani

  9. Dimensional analysis - Wikipedia

    en.wikipedia.org/wiki/Dimensional_analysis

    In engineering and science, dimensional analysis is the analysis of the relationships between different physical quantities by identifying their base quantities (such as length, mass, time, and electric current) and units of measurement (such as metres and grams) and tracking these dimensions as calculations or comparisons are performed.