A meter is an instrument used to measure electrical or other quantities. Meters are often used in science, but also in everyday life, including the measurement of water pressure. A meter is a unit of measurement of length, mass, or volume defined by the International System of Units (SI). The unit "meter" (symbol: m) is named after the French physicist André-Marie Ampère (1775–1836)
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The abbreviation "m" is sometimes written as "M" before the name of a quantity. For example, "one meter per second squared" would be written as "1 m/s2". The quantity obtained by multiplication of the numerical value of a meter with its own value is expressed in scientific notation.
For example, 19.3 km/h is written as 1.93×104 m/s2. If one adds 10 to the value in scientific notation, the result is expressed in SI units as 1 metre per second squared.