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SI Units and Derived Units Notes 2022: Download Study Materials BOOK PDF

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Unit (name)Unit (symbol)Quantity (name)Definition
metremLengthThe distance travelled by light in vacuum in  1/299792458  second.
kilogramkgMassThe mass of a small squat cylinder of ~47 cubic centimetres of platinum-iridium alloy kept in a laboratory in France
secondsTimeThe duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.
ampereAElectric currenta unit of electric current equal to a flow of one coulomb per second.
kelvinKThermodynamic Temperature1/273.16  of the thermodynamic temperature of the triple point of water
molemolAmount of SubstanceThe amount of substance of a system which contains as many elementary entities [n 4]  as there are atoms in 0.012 kilogram of carbon-12.
candelacdLuminous IntensityThe magnitude of an electromagnetic field , in a specified direction, that has a power level of 1/683 watt (1.46 x 10  -3  W) per steradian at a frequency of 540 terahertz (540 THz or 5.40 x 10  14  Hz ).

SI Derived units

NameSymbolQuantity
radianradangle
steradiansrsolid angle
hertzHzfrequency
newtonNforce, weight
pascalPapressure, stress
jouleJenergy, work, heat
wattWpower, radiant flux
coulombCelectric charge or quantity of electricity
voltVvoltage (electrical potential), emf
faradFcapacitance
ohmΩresistance, impedance, reactance
siemensSelectrical conductance
weberWbmagnetic flux
teslaTmagnetic flux density
henryHinductance
degree Celsius°Ctemperature relative to 273.15 K
lumenlmluminous flux
luxlxilluminance
becquerelBqradioactivity (decays per unit time)
grayGyabsorbed dose (of ionizing radiation)
sievertSvequivalent dose (of ionizing radiation)
katalkatcatalytic activity

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