Meters (m)

The meter is the SI base unit of length defined by the distance light travels in vacuum in 1/299,792,458 seconds. It provides a precise universal standard for length measurement in science, engineering, and daily life [bipm-si-brochure].

Origin

The meter was first defined in 1793 as one ten-millionth of the distance from the equator to the North Pole. It was redefined in 1983 by the CGPM to be based on the speed of light for improved accuracy [bipm-si-brochure].

Worldwide Use

Meters are used globally as the primary length unit in the SI system. Applications include construction, manufacturing, and national standards among nearly all countries except a few using customary units alongside SI [nist-si-guide].

Common References

  • A standard doorway is about 2 meters tall
  • An Olympic swimming pool is 50 meters long
  • A car is typically around 4 to 5 meters in length
  • Height of an average adult is approximately 1.7 meters
  • A football field is about 100 meters long excluding end zones