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  2. Orders of magnitude (length) - Wikipedia

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

    1.6 × 105 quectometers (1.6 × 10 −35 meters) – the Planck length (Measures of distance shorter than this do not make physical sense, according to current theories of physics.) 1 qm – 1 quectometer, the smallest named subdivision of the meter in the SI base unit of length, one nonillionth of a meter.

  3. Femtometre - Wikipedia

    en.wikipedia.org/wiki/Femtometre

    1000000 zeptometres = 1 femtometre = 1 fermi = 0.000001 nanometre = 10 −15 metres. 1 000 000 000 000 femtometres = 1 millimetre. For example, the charge radius of a proton is approximately 0.841 femtometres [3] while the radius of a gold nucleus is approximately 8.45 femtometres. [4] 1 barn = 100 fm 2

  4. Picometre - Wikipedia

    en.wikipedia.org/wiki/Picometre

    3.9370 × 10 −11 in Look up picometre in Wiktionary, the free dictionary. The picometre (international spelling as used by the International Bureau of Weights and Measures ; SI symbol: pm ) or picometer ( American spelling ) is a unit of length in the International System of Units (SI), equal to 1 × 10 −12 m , or one trillionth ( ⁠ 1 / 1 ...

  5. Metre - Wikipedia

    en.wikipedia.org/wiki/Metre

    The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of ⁠ 1 / 299 792 458 ⁠ of a second, where the second is defined by a hyperfine transition frequency of caesium.

  6. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    Since all gases have the same volume per mole at a given temperature and pressure far from their points of liquefaction and solidification (see Perfect gas), and air is about ⁠ 1 / 5 ⁠ oxygen (molecular mass 32) and ⁠ 4 / 5 ⁠ nitrogen (molecular mass 28), the density of any near-perfect gas relative to air can be obtained to a good ...

  7. Order of magnitude - Wikipedia

    en.wikipedia.org/wiki/Order_of_magnitude

    [contradictory] For example, the number 4 000 000 has a logarithm (in base 10) of 6.602; its order of magnitude is 6. When truncating, a number of this order of magnitude is between 10 6 and 10 7. In a similar example, with the phrase "seven-figure income", the order of magnitude is the number of figures minus one, so it is very easily ...

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  9. Ancient Greek units of measurement - Wikipedia

    en.wikipedia.org/wiki/Ancient_Greek_units_of...

    10 5 2 + 1 ⁄ 2: 1 + 1 ⁄ 4: 1 10 ⁄ 11 ... 10 6 1 meters: 0.30823: 0.77057: 1.54115: 1.8494: 3.0823: 18.4938: 30.823: 184.94: Area. The ordinary units used for ...