seal of the international bureau of weights and measures (bipm) – use measure (greek: ΜΕΤΡΩ ΧΡΩ)
|unit system||si base unit|
|1 m in ...||... is equal to ...|
| si units|| 1000 mm|
| imperial/us units|| ≈ 1.0936 yd|
≈ 39.370 in
| nautical units|| ≈ 0.00053996 nmi |
the metre (commonwealth spelling and bipm spelling) or meter (american spelling) (from the french unit mètre, from the greek noun μέτρον, "measure") is the base unit of length in the international system of units (si). the si unit symbol is m.
the metre is defined as the length of the path travelled by light in a vacuum in 1/299 792 458 of a second.
the metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the north pole along a great circle, so the earth's circumference is approximately 40000 km. in 1799, the metre 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.