SI Units1RLp@l;p];pw;pc-DB00DBOSLT@@@w@@@ )@
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@_@@@ [@!@"#@#@$@%x@&@'@@(@)@*j@+@,+@-@.@/h@0@1 -@2 @3 @4!s@5!@6!@7",@8"o@9"@:"@;%@<%z@=%@>&J@?'\@@(@A)@B*9@C*@D*@E+ @F+P@G+@H+@I,,@J,@K,@L2QuantityNameSymbolUnitsSI-UnitsTypeNotesID@DStandardZ7 A<(#-Z7A!#0lengthmetermmmbase SI-unitDefinition
The meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second!$'4masskilogramkgkgkgbase SI-unitDefinition
The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram "/timesecondsssbase SI-unitDefinition
periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom#*,.0=_electric current ampereAAAbase SI-unitDefinition
The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 x 10-7 newton per meter of length#%')6temperaturekelvinKKKbase SI-unitDefinition
The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water$)-15Bamount of substancemolemolmolmolbase SI_unitDefinition
The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12
When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles#+.14A%luminous intensitycandelacdcdcdbase SI-unitDefinition
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian#'+5Lfplane angleradianradradmm-1 = 1basic derived SI-unit Note
The radian and steradian may be used advantageously in expressions for derived units to distinguish between quantities of a different nature but of the same dimension
In practice, the symbols rad and sr are used where appropriate, but the derived unit "1" is generally omitted&),7Nsolid anglesteradiansrsrm2m-2 = 1basic derived SI-unit Note
The radian and steradian may be used advantageously in expressions for derived units to distinguish between quantities of a different nature but of the same dimension
In practice, the symbols rad and sr are used where appropriate, but the derived unit "1" is generally omitted
In photometry, the unit name steradian and the unit symbol sr are usually retained in expressions for derived units #&*ABfrequencyhertzHzHzs-1basic derived SI-unit
!*@AforcenewtonNNmkgs-2basic derived SI-Unit!(+0;KLpressure, stresspascalPaN/m2m-1kgs-2derived SI-Unit179=GWXenergy, work, quantity of heat jouleJNmm2kgs-2derived SI-Unit
$)+/9IJpower, radiant fluxwattWJ/sm2kgs-3derived SI-Unit9ACEI_`electric charge, quantity of electricitycoulombCCsAbasic derived SI-UnitDIKO]mnelectric potential difference,
electromotive forcevoltVW/Am2kgs-3A-1derived SI-Unit"$(7GHcapacitancefaradFC/Vm-2kg-1s4A2derived SI-Unit$).2@PQelectric resistanceohm Ohm V/Am2kgs-3A-2derived SI-Unit%-/3BRSelectric conductancesiemensSA/Vm-2kg-1s3A2derived SI-Unit$'+9IJmagnetic fluxWeberWbVsm2kgs-2A-1derived SI-Unit&,.4BRSmagnetic flux densityTeslaTWb/m2m2kgs-2A-1derived SI-Unit!#(6FGinductancehenryHWb/Am2kgs-2A-2derived SI-Unit$369;QCelsius temperaturedegree CelsiusCCKbasic derived SI-UnitNote
Because of the way temperature scales used to be defined, it remains common practice to express a thermodynamic temperature, symbol T, in terms of its difference from the reference temperature T0 = 273.15 K, the ice point. This temperature difference is called a Celsius temperature, symbol t, and is defined by the quantity equation t= T- T0.
The unit of Celsius temperature is the degree Celsius, symbol C. The numerical value of a Celsius temperature t expressed in degrees Celsius is given by t/C = T/K - 273.15.
It follows from the definition of t that the degree Celsius is equal in magnitude to the kelvin, which in turn implies that the numerical value of a given temperature difference or temperature interval whose value is expressed in the unit degree Celsius (C) is equal to the numerical value of the same difference or interval when its value is expressed in the unit kelvin (K). $'-<LMluminous fluxlumenlmcdsrm2m-2cd = cdderived SI-Unit #)<LMilluminanceluxlxlm/m2m2m-4cd = m-2cdderived SI-Unit+58;?UVactivity of a radionuclidebecquerelBqBqs-1basic derived SI-UnitAFINUefabsorbed dose, specific energy (imparted), kermagrayGyJ/kgm2s-2derived SI-Unit!),18Hdose equivalent sievertSvJ/kgm2s-2derived SI-UnitNote
Other quantities expressed in sieverts are ambient dose equivalent, directional dose equivalent, personal dose equivalent, and organ equivalent dose#*.2:PQcatalytic activitykatal katkats-1molbasic derived SI-Unit"05:?PQdynamic viscositypascal secondPasPasPasextended SI-unit -27<MNmoment of forcenewton meterNm Nm Nm extended SI-unit 159?PQsurface tensionnewton per
meterN/mN/mNm-1extended SI-unit !39?GXYangular velocityradian per
secondrad/srad/srads-1extended SI-unit!%?FMUfgangular accelerationradian per
second squaredrad/S2rad/S2rads-2extended SI-unit".DINUfgheat flux density, irradiancewatt per
square meterW/m2W/m2kgs-3extended SI-unit#'8<@N_`heat capacity, entropyjoule per
kelvinJ/KJ/Km2kgs-2K-1extended SI-unit$9S\epspecific heat capacity, specific entropyjoule per
kilogram kelvinJ/(kgK)J/(kgK)m2s-2K-1extended SI-unit% 38=DUVspecific energyjoule per
kilogramJ/kgJ/kgm2s-2extended SI-unit&%;CKXijthermal conductivitywatt per
meter kelvinW/(mK)W/(mK)mkgs-3K-1extended SI-unit'5:?J[\energy densityjoule per
cubic meterJ/m3J/m3kgm-1s-2extended SI-unit((7;?L]^electric field strengthvolt per
meterV/mV/mmkgs-3A-1extended SI-unit)(@EJRcdelectric charge densitycoulomb per
cubic meterC/m3C/m3sAm-3extended SI-unit*&?DIQbcelectric flux densitycoulomb per
square meterC/m2C/m2sAm-2extended SI-unit+-15DUVpermittivityfarad per
meterF/mF/mm-1kg-1s4A2extended SI-unit,-15BSTpermeabilityhenry per
meterH/mH/mmkgs-2A-2extended SI-unit-,28HYZmolar energyjoule per
moleJ/molJ/molm2kgmol-1s-2extended SI-unit.3IS]qmolar entropy, molar heat capacityjoule per
mole kelvinJ/(molK)J/(molK)m2kgmol-1s-2K-1extended SI-unit/-BGLUfgexposure
(x and gamma rays)coulomb per
kilogramC/kgC/kgsAkg-1extended SI-unit0#38=DUVabsorbed dose rategray per
secondGy/sGy/sm2s-3extended SI-unit1"5:?IZ[radiant intensitywatt per
steradianW/srW/srm2kgs-3extended SI-unit29EQXijradiancewatt per
square meter steradian W/(m2sr) W/(m2sr) kgs-3extended SI-unit33IPWctucatalytic
(activity) concentrationkatal per
cubic meterkat/m3kat/m3s-1molm-3extended SI-unit4 $&=>timeminuteminminsNon-SI-Unit (accepted)5 78timehourhhsNon-SI-Unit (accepted)667timedayddsNon-SI-Unit (accepted)7 "'>?angledegree rad Non-SI-Unit (accepted)8!&=>angleminute''rad Non-SI-Unit (accepted)9!$)@Aanglesecond ''''rad Non-SI-Unit (accepted):!$;volumeliterLLm3Non-SI-Unit (accepted)Note
This unit and its symbol l were adopted by the CIPM in 1879. The alternative symbol for the liter, L, was adopted by the CGPM in 1979 in order to avoid the risk of confusion between the letter l and the number 1 . Thus, although both l and L are internationally accepted symbols for the liter, to avoid this risk, the preferred symbol for use is L. Neither a lowercase script letter l nor an uppercase script letter L are approved symbols for the liter;"$&)@tweightmetric tonttkgNon-SI-Unit (accepted)Note
In many countries, this unit is called "tonne"<!#:;NoneneperNpNp1Non-SI-Unit (accepted)=-DNonebelBB(1/2) ln 10 Np Non-SI-Unit (accepted)Note
The bel is most commonly used with the SI prefix deci: 1 dB = 0.1 B>%(+-Denergyelectronvolt eVeVJNon-SI-Unit (accepted)Note
The electronvolt is the kinetic energy acquired by an electron passing through a potential difference of 1 V in vacuum. The value must be obtained by experiment, and is therefore not known exactly?/136M!massunified atomic
mass unituukgNon-SI-Unit (accepted)Note
The unified atomic mass unit is equal to 1/12 of the mass of an unbound atom of the nuclide 12C, at rest and in its ground state. The value must be obtained by experiment, and is therefore not known exactly@),/1Hclengthastronomical
unituauamNon-SI-Unit (accepted)Note
The astronomical unit is a unit of length. Its value is such that, when used to describe the motion of bodies in the solar system, the heliocentric gravitation constant is (0.017 202 098 95)2 ua3d-2. The value must be obtained by experiment, and is therefore not known exactlyA&+02LMlengthnautical mile nonenonemNon-SI-Unit (discouraged)B#(,FGvelocityknotnonenonem/sNon-SI-Unit (discouraged)C :;areaareaam2Non-SI-Unit (discouraged)D!$'ABareahectare haham2Non-SI-Unit (discouraged)E!%(BCpressurebarbarbarPaNon-SI-Unit (discouraged)F "$&@AlengthngstrmmNon-SI-Unit (discouraged)G9:areabarnbbNon-SI-Unit (discouraged)H+147:TUactivity of a radionuclidecurieCiCiBqNon-SI-Unit (discouraged)I'0249STexposure (x and rays)roentgenRRC/kgNon-SI-Unit (discouraged)J@DHLOijbsorbed dose, specific energy (imparted), kermaradradradGyNon-SI-Unit (discouraged)K $(,/IXdose equivalentremremremSvNon-SI-Unit (discouraged) 2001 disynetL