List of Scientific Units

Scientific units are standard quantities used to measure and describe the physical properties of matter and phenomena in the universe. They provide a consistent way to express measurements clearly and accurately, so that scientists and people around the world can easily communicate. Scientific units are part of the International System of Units (SI), which is based on the metric system. This system includes units for measuring length, mass, time, electric current, temperature, amount of substance, and light intensity.

The basic unit of length is meter (m), which measures distance. Kilogram (kg) is used for mass, which measures the amount of matter in an object. Time is measured in seconds (s), which helps us measure periods and intervals. Electric current is measured in amperes (A), which indicates the flow of electric charge. Temperature is measured in Kelvin (K), which measures how hot or cold an object is. Mole is used for the amount of substance, which helps in counting particles like atoms or molecules. Light intensity, which is the brightness of a light source, is measured in candela (cd).

Apart from these basic units, there are also derived units, which are formed by combination of basic units. For example, the unit of speed is meters per second (m/s), which combines length and time. The unit of force is the newton (N), which combines mass, length, and time (kg·m/s²).

Scientific units are important because they ensure that everyone uses the same standards, making it easier to compare and reproduce results. Without standard units, communication and collaboration in science and engineering would become much more difficult, leading to confusion and errors. The consistent use of scientific units enables advancements in technology, medicine, engineering, and many other fields, providing a common language for scientists and professionals. In this article we tell us about list of scientific units.

 SI Base Units

SI Base UnitSymbolQuantityNamed After
AmpereAElectric currentAndré-Marie Ampère
KelvinKThermodynamic temperatureLord Kelvin (William Thomson)

SI Derived Units

SI Derived UnitQuantityNamed After
Becquerel (Bq)RadioactivityHenri Becquerel
Degree Celsius (°C)TemperatureAnders Celsius
Coulomb (C)Electric chargeCharles-Augustin de Coulomb
Farad (F)CapacitanceMichael Faraday
Gray (Gy)Absorbed dose of radiationLouis Harold Gray
Henry (H)InductanceJoseph Henry
Hertz (Hz)FrequencyHeinrich Rudolf Hertz
Joule (J)Energy, work, heatJames Prescott Joule
Newton (N)ForceIsaac Newton
Ohm (Ω)Electrical resistanceGeorg Ohm
Pascal (Pa)PressureBlaise Pascal
Siemens (S)Electrical conductanceWerner von Siemens
Sievert (Sv)Radiation dose equivalentRolf Sievert
Tesla (T)Magnetic flux densityNikola Tesla
Volt (V)Electric potential, electromotive forceAlessandro Volta
Watt (W)Power, radiant fluxJames Watt
Weber (Wb)Magnetic fluxWilhelm Eduard Weber

Centimetre–Gram–Second System of Units

UnitSymbolQuantityNamed After
BiotBiElectric currentJean-Baptiste Biot
BuckinghamBElectric quadrupole momentA. David Buckingham
DebyeDElectric dipole momentPeter Debye
EotvosEGravitational gradientLoránd Eötvös
GalileoGalAccelerationGalileo Galilei
GaussG or GsMagnetic flux densityCarl Friedrich Gauss
GilbertGbMagnetomotive forceWilliam Gilbert
Goeppert-MayerGMTwo-photon absorption cross-sectionMaria Goeppert-Mayer
KayserkayserWavenumberHeinrich Kayser
MaxwellMxMagnetic fluxJames Clerk Maxwell
OerstedOeMagnetic field strengthHans Christian Ørsted
PoisePDynamic viscosityJean Léonard Marie Poiseuille
Rayl or RayleighRaylAcoustic impedanceJohn William Strutt, 3rd Baron Rayleigh
RayleighRPhoton fluxRobert John Strutt, 4th Baron Rayleigh
StokesS or StKinematic viscosityGeorge Gabriel Stokes

No More Longer in Use

NameSymbolQuantityNamed After
FranklinFrElectric ChargeBenjamin Franklin
ClausiusClEntropyRudolf Clausius

Other Scientific Units

NameSymbolQuantityNamed After
ÅngströmÅDistanceAnders Jonas Ångström
BaudBdSymbol RateEmile Baudot
Bark ScalePsychoacoustical ScaleHeinrich Barkhausen
BrewsterBStress Optic CoefficientDavid Brewster
CentimorgancMRecombination FrequencyThomas Hunt Morgan
CurieCiRadioactivityMarie and Pierre Curie
DaltonDaAtomic MassJohn Dalton
DarcyDPermeabilityHenry Darcy
DecibeldBDimensionless Proportions and RatiosAlexander Graham Bell
Degree Fahrenheit°FTemperatureDaniel Gabriel Fahrenheit
Degree Rankine°RTemperatureWilliam John Macquorn Rankine
Dobson UnitDUAtmospheric OzoneGordon Dobson
ErlangEDimensionless Volume of Telecommunications TrafficAgner Krarup Erlang
FermifmDistanceEnrico Fermi
HartleyHartInformationRalph Hartley
Hounsfield ScaleRadiodensityGodfrey Newbold Hounsfield
JanskyJyElectromagnetic FluxKarl Jansky
LangleylySolar RadiationSamuel Pierpont Langley
LangmuirLGas Exposure DoseIrving Langmuir
Mach NumberMaRelative SpeedErnst Mach
NeperNpRelative Power LevelJohn Napier
Degree Öchsle°OeDensityFerdinand Öchsle
Rockwell ScaleHRIndentation HardnessStanley Rockwell
RöntgenRDosage of X-rays or Gamma RadiationWilhelm Röntgen
Richter MagnitudeEarthquake PowerCharles Francis Richter
Scoville UnitsCapsaicin Content of Chili PeppersWilbur Scoville
ShannonShInformationClaude Shannon
SiegbahnxuDistanceManne Siegbahn
SvedbergS or SvSedimentation RateTheodor Svedberg
SverdrupSvVolume Transport RateHarald Sverdrup
TorrTorrPressureEvangelista Torricelli
TrolandTdLuminance (Human Eye)Leonard Troland

Natural Scientific Unit Systems

ParameterPlanck UnitsStoney Units
LengthPlanck length (ℓP)Stoney length (ℓS)
MassPlanck mass (mP)Stoney mass (mS)
TimePlanck time (tP)Stoney time (tS)
Electric ChargePlanck charge (qP)Stoney charge (qS)
Electric CurrentPlanck current (IP)Stoney current (IS)
TemperaturePlanck temperature (TP)Stoney temperature (TS)
EnergyPlanck energy (EP)Stoney energy (ES)
ForcePlanck force (FP)Stoney force (FS)

Scientific Units That No Longer in Use

No Longer in UseFieldInventor/Originator
Mercalli Intensity ScaleEarthquake EffectsGiuseppe Mercalli
Degree Réaumur (°R)TemperatureRené Antoine Ferchault de Réaumur
Degree Delisle (°D)TemperatureJoseph-Nicolas Delisle
Degree Newton (°N)TemperatureIsaac Newton
Degree Rømer (°Rø)TemperatureOle Rømer
Degree Baumé (°Bé)DensityAntoine Baumé
Einstein (E)PhotochemistryAlbert Einstein
Poncelet (p)PowerJean-Victor Poncelet
Faraday (Fd)Electrical ChargeMichael Faraday
45370cookie-checkList of Scientific Units


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