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A Meter is a SI Base Unit that is used to measure length.



  • (Wikipedia, 2018) ⇒ Retrieved:2018-12-28.
    • The metre (British spelling and BIPM spelling[1]) or meter (American spelling) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in some metric systems, including the International System of Units (SI). The SI unit symbol is m"[2]. The metre is defined as the length of the path travelled by light in a vacuum in second .

      The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole – as a result the Earth's circumference is approximately 40,000 km today. In 1799, it was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. In 1983, the current definition was adopted.

      The imperial inch is defined as 0.0254 metres (2.54 centimetres or 25.4 millimetres). One metre is about inches longer than a yard, i.e. about inches.

  1. "17th General Conference on Weights and Measures (1983), Resolution 1". Retrieved 19 September 2012.
  2. "Base unit definitions: Meter". National Institute of Standards and Technology. Retrieved 28 September 2010.