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  2. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    Thus, in the above example, after an increase and decrease of x = 10 percent, the final amount, $198, was 10% of 10%, or 1%, less than the initial amount of $200. The net change is the same for a decrease of x percent, followed by an increase of x percent; the final amount is p (1 - 0.01 x )(1 + 0.01 x ) = p (1 − (0.01 x ) 2 ) .

  3. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    At this scale, the width of a human hair is about 10 times that of the image. [70] To help compare different orders of magnitude this section lists lengths between 10 −8 and 10 −7 m (10 nm and 100 nm). 10 nm Shortest extreme ultraviolet wavelength or longest X-ray wavelength [71] 10 nm – the average length of a nanowire

  4. Inverse-square law - Wikipedia

    en.wikipedia.org/wiki/Inverse-square_law

    The force of attraction or repulsion between two electrically charged particles, in addition to being directly proportional to the product of the electric charges, is inversely proportional to the square of the distance between them; this is known as Coulomb's law. The deviation of the exponent from 2 is less than one part in 10 15. [8]

  5. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    For an approximately normal data set, the values within one standard deviation of the mean account for about 68% of the set; while within two standard deviations account for about 95%; and within three standard deviations account for about 99.7%.

  6. Ratio - Wikipedia

    en.wikipedia.org/wiki/Ratio

    The ratio of width to height of standard-definition television. In mathematics, a ratio (/ ˈ r eɪ ʃ (i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3).

  7. Sexagesimal - Wikipedia

    en.wikipedia.org/wiki/Sexagesimal

    Sexagesimal, also known as base 60, [1] is a numeral system with sixty as its base.It originated with the ancient Sumerians in the 3rd millennium BC, was passed down to the ancient Babylonians, and is still used—in a modified form—for measuring time, angles, and geographic coordinates.

  8. Boreal Biogeographic Region - Wikipedia

    en.wikipedia.org/wiki/Boreal_Biogeographic_Region

    60% of the land in the European Union part of the region is covered by forest, but most of this is commercial plantings. Less than 5-10% of the forest is old growth. The typical western taiga forest contains Norway spruce (Picea abies) and Scots pine (Pinus sylvestris) growing on shallow soil covered in moss, lichen and ericaceous shrubs. [1]

  9. Lumileds - Wikipedia

    en.wikipedia.org/wiki/Lumileds

    The company sells products for automotive, illumination and specialty applications, [10] with automotive lighting comprising 60% of its sales in 2015. [ 11 ] In architectural lighting they released the Luxeon C in 2015, a family of high-power LED light sources capable of delivering multiple colors from a single focal length.