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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.
The SI system after 1983, but before the 2019 revision: Dependence of base unit definitions on other base units (for example, the metre is defined as the distance travelled by light in a specific fraction of a second), with the constants of nature and artefacts used to define them (such as the mass of the IPK for the kilogram).
The base units and the derived units formed as the product of powers of the base units with a numerical factor of one form a coherent system of units. Every physical quantity has exactly one coherent SI unit. For example, 1 m/s = (1 m) / (1 s) is the coherent derived unit for velocity.
A base unit is a unit adopted for expressing a base quantity. A derived unit is used for expressing any other quantity, and is a product of powers of base units. For example, in the modern metric system, length has the unit metre and time has the unit second, and speed has the derived unit metre per second.
An early definition of the metre was one ten-millionth of the Earth quadrant, the distance from the North Pole to the Equator, measured along a meridian through Paris.. During French Revolution, the traditional units of measure were to be replaced by consistent measures based on natural phenomena.
A base unit of measurement (also referred to as a base unit or fundamental unit) is a unit of measurement adopted for a base quantity.A base quantity is one of a conventionally chosen subset of physical quantities, where no quantity in the subset can be expressed in terms of the others.
Installed Base of Meter Data Management Systems Will Serve More Than 480 Million Smart Meters by 2020, Forecasts Pike Research BOULDER, Colo.--(BUSINESS WIRE)-- The last year has seen a major ...
10 meters – wavelength of the highest shortwave radio frequency, 30 MHz; 10.2 meters – length of the Panzer VIII Maus, the world's largest tank; 12 meters – height of the Newby-McMahon Building, the world's littlest skyscraper; 23 meters – height of Luxor Obelisk, located in the Place de la Concorde, Paris, France
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