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  2. Thousandth of an inch - Wikipedia

    en.wikipedia.org/wiki/Thousandth_of_an_inch

    Until then, workers such as millwrights, boilermakers, and machinists in the Anglosphere measured only in traditional fractions of an inch, divided via successive halving, usually only as far as 64ths (1, 1 ⁄ 2, 1 ⁄ 4, 1 ⁄ 8, 1 ⁄ 16, 1 ⁄ 32, 1 ⁄ 64). Each 64th is about 16 thou.

  3. Scientific notation - Wikipedia

    en.wikipedia.org/wiki/Scientific_notation

    Any real number can be written in the form m × 10 ^ n in many ways: for example, 350 can be written as 3.5 × 10 2 or 35 × 10 1 or 350 × 10 0. In normalized scientific notation (called "standard form" in the United Kingdom), the exponent n is chosen so that the absolute value of m remains at least one but less than ten ( 1 ≤ | m | < 10 ).

  4. Orders of magnitude (time) - Wikipedia

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

    5.4 × 10 83 Qs (1.7 × 10 106 years): The approximate lifespan of a supermassive black hole with a mass of 20 trillion solar masses [21] 10 10 10 76.66 {\displaystyle 10^{10^{10^{76.66}}}} Qs: The scale of an estimated Poincaré recurrence time for the quantum state of a hypothetical box containing an isolated black hole of stellar mass [ 22 ...

  5. Orders of magnitude (numbers) - Wikipedia

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

    Mathematics: 2,520 (5×7×8×9 or 2 3 ×3 2 ×5×7) is the least common multiple of every positive integer under (and including) 10. Terrorism: 2,996 persons (including 19 terrorists) died in the terrorist attacks of September 11, 2001. Biology: the DNA of the simplest viruses has 3,000 base pairs. [11]

  6. English numerals - Wikipedia

    en.wikipedia.org/wiki/English_numerals

    Alternatively, and for greater numbers, one may say for 1 ⁄ 2 "one over two", for 5 ⁄ 8 "five over eight", and so on. This "over" form is also widely used in mathematics. Fractions together with an integer are read as follows: 1 + 1 ⁄ 2 is "one and a half" 6 + 1 ⁄ 4 is "six and a quarter" 7 + 5 ⁄ 8 is "seven and five eighths"

  7. List of physical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_constants

    6.674 30 (15) × 10 −11 m 3 ⋅kg −1 ⋅s −2: 2.2 × 105 [6] ... 1.7 × 10 −11 [32] / W-to-Z mass ratio: 0.881 45 (13) 1.5 × 10 −4 [33] ⁡ = (/) sine ...

  8. 5000 (number) - Wikipedia

    en.wikipedia.org/wiki/5000_(number)

    5233 – prime of the form 2p-1; 5244 = 22 2 + 23 2 + … + 29 2 = 20 2 + 21 2 + … + 28 2; 5249 – highly cototient number [9] 5253 – triangular number; 5279 – Sophie Germain prime, twin prime with 5281, 700th prime number; 5280 is the number of feet in a mile. [10] It is divisible by three, yielding 1760 yards per mile and by 16.5 ...

  9. Percent sign - Wikipedia

    en.wikipedia.org/wiki/Percent_sign

    English style guides prescribe writing the percent sign following the number without any space between (e.g. 50%). [sources 1] However, the International System of Units and ISO 31-0 standard prescribe a space between the number and percent sign, [8] [9] [10] in line with the general practice of using a non-breaking space between a numerical value and its corresponding unit of measurement.