Metre - Wikipedia
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. [2]
Metre (m) | Britannica
Metre (m), in measurement, fundamental unit of length in the metric system and in the International Systems of Units (SI). It is equal to approximately 39.37 inches in the British Imperial and United States Customary systems. The metre was historically defined by the French Academy of Sciences in
History of the metre - Wikipedia
The metre is the length of the path travelled by light in vacuum during a time interval of 1 ⁄ 299,792,458 of a second. This definition was reworded in 2019: [3] The metre, symbol m, is the SI unit of length.
How long is a Meter - Measurement and Length Conversions
Meter is the SI unit of length. Length can be expressed in other units like, centimeters, inches, feet, and yards which can be converted to meters. Though meters and inches are units of length, but their values differ. In this article we will learn the relation between meter, centimeter, millimeter, inches, feet and yards.
How Long Is a Meter? Definition, Conversion, Examples
Meter (m) is an SI unit of measuring length. To understand how long 1 meter is, we will try to compare it with the larger and smaller units of length, such as feet, yards, centimeters, inches, etc. It will give us a better idea of how 1 meter compares to other measurements. Metric units of length are millimeter, centimeter, meter, and kilometer.
Meter | NIST - National Institute of Standards and Technology
2019年5月9日 · A meter would be defined as a precise number of multiples of this wavelength. In 1951, NIST distributed 13 “Meggers lamps” to scientific institutions and industry labs. The agency sought to further increase the precision of its technique for redefining the meter.
SI Units – Length | NIST
2010年4月12日 · The meter (m) is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299,792,458 when expressed in the unit m s −1, where the second is defined in terms of ∆ν Cs. The meter was once defined by a physical artifact - two marks inscribed on a platinum-iridium bar, like these from the NIST Museum .
The metre (meter) - SI Units Explained
In 1791 the French Academy of Sciences decided to adopt a new unit of measurement, called the metre, based on 1/10,000,000th of the distance from Earth's equator to the North Pole.
METRE中文(简体)翻译：剑桥词典 - Cambridge Dictionary
metre翻译：测量, （长度单位）米, 诗歌, （诗歌的）韵律，格律。了解更多。
metre (m) - NPL - NPLWebsite
Since 1983, the metre has been internationally defined as the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second. This definition can be realised simply and accurately using modern techniques and the speed of light is regarded to be a universal constant, making it ideal as the basis for a length ...