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The meter (m) is the base unit of length in the International System of Units (SI). It is used to measure distances and dimensions and serves as the foundation for other units of measurement. The meter is fundamental in various scientific, engineering, and everyday applications, providing a consistent standard for length measurement across different fields.

Originally defined in 1791 as one ten-millionth of the distance from the equator to the North Pole, the definition of the meter has evolved with advancements in measurement technology. Currently, the meter is defined based on the speed of light. It is the distance light travels in a vacuum in 1/299,792,458 seconds. This definition ensures a precise and reproducible measurement of length.

The meter is used globally in a wide range of applications, including scientific research, engineering, construction, and everyday activities. It is the standard unit for measuring heights, lengths, and distances. For instance, architectural plans, road signs, and scientific experiments all utilize the meter to ensure accuracy and consistency in measurements.

In addition to being a primary unit of measurement, the meter can be converted to other units as needed. For example:

• 1 meter = 1,000 millimeters (mm)
• 1 meter = 100 centimeters (cm)
• 1 meter ≈ 3.281 feet (ft)
• 1 meter ≈ 39.37 inches (in)

These conversions are useful for translating measurements between different systems or scales.

• https://en.wikipedia.org/wiki/Meter
• https://www.bipm.org/en/measurement-units

Snippet from Wikipedia: Metre

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 ⁠1/299792458⁠ of a second, where the second is defined by a hyperfine transition frequency of caesium.

The metre was originally defined in 1791 by the French National Assembly as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's polar circumference is approximately 40000 km.

In 1799, the metre was redefined in terms of a prototype metre bar. The bar used was changed in 1889, and in 1960 the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. The current definition was adopted in 1983 and modified slightly in 2002 to clarify that the metre is a measure of proper length. From 1983 until 2019, the metre was formally defined as the length of the path travelled by light in vacuum in ⁠1/299792458⁠ of a second. After the 2019 revision of the SI, this definition was rephrased to include the definition of a second in terms of the caesium frequency Δν_Cs. This series of amendments did not alter the size of the metre significantly – today Earth's polar circumference measures 40007.863 km, a change of about 200 parts per million from the original value of exactly 40000 km, which also includes improvements in the accuracy of measuring the circumference.

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