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SI derived units are part of the SI system of measurement units and are derived from the seven SI base units.

1 Units with Special names and Symbols


Physical quantity Name of SI unit Symbol for SI unit Expression in terms of other units Expression in terms of SI base units
plane angle radian rad
solid angle steradian sr
frequency hertz Hz
force, weight newton N
pressurePressure (symbol: p is a measure of force per unit area. where p is the pressure F is the force A is the area Often F is taken to be the of the magnitude of the mean vector force normal to the surface of area A upon which it exerts; the "surface" not nece, stressIn physics, stress is the internal distribution of forces within a body that balance and react to the loads applied to it. Stress is a tensor quantity with nine terms, but which can be described fully by six terms due to symmetry. Simplifying assumptions pascalThe pascal (symbol Pa is the SI unit of pressure. It is equivalent to one newton per square metre. The unit is named after Blaise Pascal, the eminent French mathematician, physicist and philosopher. 1 Pa : 1 N/m² 1 (kg·m/s²)/m² 1 kg/m·s² : 0. 01 millibar Pa
energyThis article is about the scientific concept. Energy use by humans is discussed in other articles''. Energy generally and qualitatively speaking, is the property (or the quantity of the property) of doing things or supplying power. The expressions energy, workThis article is about the scientific concept. Energy use by humans is discussed in other articles''. Energy generally and qualitatively speaking, is the property (or the quantity of the property) of doing things or supplying power. The expressions energy, heatCommonly, heat is estrus, a period of increased sexual drive in female mammals. For the National Basketball Association team, see Miami Heat. For the movie, see Heat (movie). Heat (abbreviated Q also called heat change is the transfer of thermal energy be jouleThe joule (symbol J also called newton metre or coulomb volt is the SI unit of energy and work. The unit is pronounced to rhyme with "tool", and is named in honour of the physicist James Prescott Joule (1818-1889). 1 joule 1 N · 1 m 1 newton · 1 metre 1 k J
powerMechanical power In physics, power (symbol: P is the amount of work W done per unit of time t''. This can be modeled as an energy flow, equivalent to the rate of change of the energy in a system, or the time rate of doing work, as defined by : where P is, radiant flux watt W
electric charge coulomb C
electric potential, electromotive force volt V
electric capacitance farad F
electrical resistance, impedance, reactance ohm Ω
electric conductance siemens S
magnetic flux weber Wb
magnetic flux density, magnetic inductivity tesla T
inductance henry H
temperature degree Celsius °C
luminous flux lumen lm
illuminance lux lx
activity (radioactive) becquerel Bq
absorbed dose (of radiation) gray Gy
dose equivalent (dose equivalent index) sievert Sv
catalytic activity katal kat






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