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# Units of measurement

The ampere (symbol: A) is the SI unit of electric current (symbol: I) and is one of the seven SI base units. It is named after André-Marie Ampère (1775–1836), French mathematician and physicist, considered the father of electrodynamics. In practice, its name is often shortened to amp.

Bar is a metric unit of pressure defined as 100,000 Pa (100 kPa), though not part of the International System of Units (SI).

Measurement unit that is adopted by convention for a base quantity. For example: The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units are derived.

The Baudot code is an early character encoding for telegraphy invented by Émile Baudot in the 1870s.

Becquerel (Bq) is the unit of radioactivity in the International System of Units (SI).

The candela (symbol: cd) is the SI base unit of luminous intensity; that is, power emitted by a light source in a particular direction, weighted by the luminosity function (a standardized model of the sensitivity of the human eye to different wavelengths, also known as the luminous efficiency function).

Unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius, who developed a similar temperature scale.

SI derived unit of electric charge. It is defined as the charge transported by a steady current of one ampere in one second.

Measurement unit for a derived quantity. Examples: the metre per second (m/s) and the centimeter per second (cm/s) are derived units of speed in the SI. The kilometre per hour (km/h) is a unit of speed outside the SI but accepted for use with the SI. The knot, equal to one nautical mile per hour, is a unit of speed outside the SI.

A unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres).

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06/14/1736
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