Common Measurement Units - Derived SI Units

Unit	Symbol	Equals	Base SI Units	Definition
becquerel	Bq	-	s-1	The becquerel is the unit of radioactivity, defined as the activity of a quantity of radioactive material in which one nucleus decays per second. It was named after Henri Becquerel (1852-1908).
coulomb	C	-	s·A	The coulomb is the unit of electric charge. 1 coulomb is the amount of charge carried by an electric current of 1 A within 1 second. It is named after Charles-Augustin de Coulomb (1736-1806).
degree Celsius	°C	-	K	The degree Celsius (°C) is a unit of temperature named after the Swedish astronomer Anders Celsius (1701-1744), who first proposed it in 1742. The Celsius temperature scale was designed so that the freezing point of water is 0 degrees, and the boiling point is 100 degrees at standard atmospheric pressure. Celsius temperature has the same scaling as the Kelvin temperature but is shifted by 273.15 K (i.e. 0 °C = 273.15 K)
farad	F	C/V	m-2·kg-1·s4·A2	The farad is the SI unit of electric capacitance (which is the capacity to store electric charges). It is named after the English chemist and physicist Michael Faraday (1791-1867). A farad is a rather large unit for everyday usage (µF and nF are more appropriate).
gray	Gy	J/kg	m2·s-2	A gray is the unit of energy for the absorbed dose of radiation. One gray is the absorption of one joule of radiation energy by one kilogram of matter. It was defined in 1940 by Louis Harold Gray (1905-1965).
henry	H	Wb/A	m2·kg·s-2·A-2	The henry is the unit of inductance. The inductance of an electric circuit is one henry if the rate of change of the current in the circuit of 1 A/s results in an electromotive force of 1 V. The unit is named after the American mathematician and physicist Joseph Henry (1797-1878).
hertz	Hz		s-1	The hertz is the unit of the frequency of a periodic process. One hertz indicates that 1 cycle of the process occurs per second. It is named after the German physicist Heinrich Rudolph Hertz (1857-1894).
joule	J	N·m = W·s = C·V	m2·kg·s-2	The joule is the unit of work or energy. One joule is the amount of work done when an applied force of 1 newton moves through a distance of 1 meter in the direction of the force. It is named after the English physicist James Prescott Joule (1818-89).
katal	kat		s-1·mol	Katal is the unit for catalytic activity. It is defined as moles per second. The katal is a rather large unit for most purposes, thus µkat and nkat are more appropriate.
lumen	lm	cd·sr	m2·m-2·cd = cd	The lumen is the unit of luminous flux. It is the amount of light that falls on a unit area at unit distance from a source of one candela.
lux	lx	lm/m2	m2·m-4·cd = m-2·cd	The lux is the unit of illuminance or illumination. It is equal to one lumen per square meter.
newton	N		m·kg·s-2	The newton is the unit of force. One newton is the force required to give a mass of 1 kilogram an acceleration of 1 m/s2. It is named after the English mathematician and physicist Sir Isaac Newton (1642-1727).
ohm	Ω	V/A	m2·kg·s-3·A-2	The ohm is the unit of resistance of an electric conductor. A resistor of 1 Ohm allows a current of 1 A to flow if a voltage of 1 V is applied to its ends. Its symbol, is the capital Greek letter 'omega'. It is named after the German physicist Georg Simon Ohm (1789-1854).
pascal	Pa	N/m2	m-1·kg·s-2	The pascal is the SI unit of pressure. One pascal is the pressure generated by a force of 1 newton acting on an area of 1 square meter. It is named after the French mathematician, physicist and philosopher Blaise Pascal (1623-1662).
radian	rad	-	m·m-1 = 1	The radian is a unit of angle measure. It is defined as the angle subtended at the center of a circle by an arc of circumference equal in length to the radius of the circle. Please note that a radian is based on the unit 1 (it is a ratio of two lengths).
siemens	S	A/V	m-2·kg-1·s3·A2	The siemens is a unit of measurement for electric conductance, being the inverse of the resistance (Ω-1). It is named after Werner von Siemens (1816-1892).
sievert	Sv	J/kg	m2·s-2	The sievert is a unit of equivalent dose or effective dose of radiation. It is named after the Swedish medical physicist Rolf Sievert (1896-1966). The equivalent dose to a tissue is found by multiplying the absorbed dose by a "quality factor", dependent upon radiation type. The effective dose to an individual can then be found by multiplying the effective dose by a factor dependent upon the part of the body irradiated.
steradian	sr	-	m2·m-2 = 1	The steradian is the unit of solid angle, and the 3-dimensional equivalent of the radian. The steradian is defined as the solid angle subtended at the center of a sphere of radius r by a portion of the surface of the sphere having an area of r2. Please note that a radian is based on the unit 1 (it is a ratio of two areas).
tesla	T	Wb/m2	kg·s-2·A-1	The tesla is the unit of magnetic flux density (or magnetic inductivity).It was named in honor of the Serbian-American inventor and electrical engineer Nikola Tesla (1856-1943).
volt	V	W/A	m2·kg·s-3·A-1	The volt is the unit of electric potential. One volt is the difference of potential between two points of an electical conductor when a current of 1 A flowing between those points dissipates a power of 1 W. It is named after the Italian physicist Alessandro G. A. Volta (1745-1827).
watt	W	J/s	m2·kg·s-3	The watt is the rate in joules per second at which energy is being used or dissipated. One watt is a power of 1 joule per second. It is named after the Scottish engineer James Watt (1736-1819).
weber	Wb	V·s	m2·kg·s-2·A-1	The weber is a unit of magnetic flux, equal to the flux linking a circuit of one turn that produces an electromotive force of one volt when reduced uniformly to zero in one second. It is named after the German physicist W.E. Weber (1804-1891).