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  2. Square root of 2 - Wikipedia

    en.wikipedia.org/wiki/Square_root_of_2

    The fraction ⁠ 99 / 70 ⁠ (≈ 1.4142857) is sometimes used as a good rational approximation with a reasonably small denominator. Sequence A002193 in the On-Line Encyclopedia of Integer Sequences consists of the digits in the decimal expansion of the square root of 2, here truncated to 65 decimal places: [ 2 ]

  3. Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Duodecimal

    The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.

  4. Diffraction-limited system - Wikipedia

    en.wikipedia.org/wiki/Diffraction-limited_system

    The beam quality of a laser beam is characterized by how well its propagation matches an ideal Gaussian beam at the same wavelength. The beam quality factor M squared (M 2 ) is found by measuring the size of the beam at its waist, and its divergence far from the waist, and taking the product of the two, known as the beam parameter product .

  5. 0-12-0 - Wikipedia

    en.wikipedia.org/wiki/0-12-0

    The only others of the type, was a class of ten 0-12-0T locomotives built by Hanomag in 1922 for the Bulgarian State Railways (BDŽ). They were initially numbered 4001–4010 , but were renumbered 45.01 to 45.10 in 1935–1936. [ 3 ]

  6. Pound sterling - Wikipedia

    en.wikipedia.org/wiki/Pound_sterling

    There was a further decline during the remainder of 2008, most dramatically on 29 December when its euro rate hit an all-time low at €1.0219, while its US dollar rate depreciated. [120] [121] Sterling appreciated in early 2009, reaching a peak against the euro of £1 to €1.17 in mid-July. In the following months sterling remained broadly ...

  7. Humidity - Wikipedia

    en.wikipedia.org/wiki/Humidity

    This fraction more accurately follows the ideal gas law. On the contrary the saturated volume is the volume a gas mixture would have if humidity was added to it until saturation (or 100% relative humidity).

  8. Manchester Township, New Jersey - Wikipedia

    en.wikipedia.org/wiki/Manchester_Township,_New...

    Manchester Township is a township in Ocean County, in the U.S. state of New Jersey.The township is noted for containing the Lakehurst Naval Air Station, the site of the infamous Hindenburg disaster of May 6, 1937.

  9. Demographics of Russia - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_Russia

    The crude birth rate – 8.9 per 100,000 inhabitants – was the lowest since the year 2000. [35] Russia has a low fertility rate with 1.42 children per woman in 2022, below 2.1 children per woman, which must be the number reached to maintain its population. [35]