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What is a Millimeter?
The millimeter (mm) is a unit of length in the metric system, equal to one-thousandth of a meter or 0.1 centimeters. It is a derived unit of the International System of Units (SI) and is commonly used to measure very short lengths, particularly in scientific and engineering contexts.
History and Origin of the Millimeter
The millimeter has its roots in the establishment of the metric system. As a decimal multiple of the meter, its definition has evolved along with changes to the meter's definition over time.
Current Use of the Millimeter
The millimeter is used in scientific, engineering, and technical fields to measure very short lengths. It is suitable for scenarios requiring extremely precise measurements, such as in mechanical manufacturing and precision instrument manufacturing.
- 开发团队： International Bureau of Weights and Measures (BIPM)
- 首发时间： 1799
- 相关链接： https://en.wikipedia.org/wiki/Millimetre https://www.bipm.org/en/measurement-units/
What is a Meter?
The meter (symbol: m) is the base unit of length in the International System of Units (SI). It is defined as the distance traveled by light in vacuum in 1/299,792,458 seconds. One meter equals 100 centimeters or 1000 millimeters, making it one of the most widely used units of length globally.
History and Origin of the Meter
Originally defined in 1793 as 'one ten-millionth of the distance from the equator to the North Pole along a meridian,' the meter has evolved over time. In 1889, the international prototype meter was introduced. The definition was updated in 1960 using the wavelength of krypton-86 radiation, and since 1983, the meter has been officially defined based on the speed of light.
Current Use of the Meter
The meter is widely used in science, engineering, construction, and education across most countries as the standard unit of length. Common applications include measuring distances, heights, and depths. Derived units such as centimeters (cm) and kilometers (km) are frequently used for smaller or larger measurements, including everyday uses like human height measurement and road distance calculation.
- 开发团队： International Bureau of Weights and Measures (BIPM)
- 首发时间： 1799
- 相关链接： https://en.wikipedia.org/wiki/Metre https://www.bipm.org/en/measurement-units/