SI Dimensions of Physical Quantities
Listed by Category
compiled by Stanislav Sýkora, Extra Byte, Via R.Sanzio 22C, Castano Primo, Italy 20022
in Stan's Library, Ed.S.Sykora, Vol.I. First release February 28, 2005.
Permalink via DOI:  10.3247/SL1Phys06.004
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Quantity Dimension Alternatives Root definition and Notes
Basic SI quantities 
Length  m  m  meter 
Mass  kg  kg  kilogram 
Time  s  s  second 
Current, electric  A  A  ampere 
Temperature  K  K  kelvin 
Quantity of substance  mol  mol  mole 
Luminosity | Luminous intensity  cd  cd  candle 
Universal dimensionless quantities 
Ratio of like quantities  1    Q1/Q2, with Q1 and Q2 having the same dimension 
Relative variation  1    ΔQ/Q, for any quantity Q. 
Logarithmic scale differential | Relative differential  1    d{ln(Q)} = dQ/Q, for any quantity Q 
Number | Count of events/instances  1    This covers all kinds of enumerations. 
Probability of an event  1    Real number lying in the interval [0,1]. 
Plane angle  1  rad  radian 
Phase angle  1  rad  φ in exp(i(ωt+φ)) 
Solid angle  1  sr  steradian 
Logarithmic ratio logb(A/A')  1  log in any base b  Applicable to any ratio of like quantities. 
Logarithmic ratio ln(A/A')  1  Np  neper. Uses natural logarithm. 
Ln-scale probability density  1  Np-1 [Probability]/[Natural-logarithmic ratio] 
Logarithmic ratio Log(P/P')/10  1  dB  decibel. Uses base-10 logarithm. Applies to power P 
Logarithmic ratio Log(X/X')/20  1  dB  decibel. Uses base-10 logarithm. Applies to amplitudes X 
Gain of a device  1  often in dB  [Output]/[Input], provided they are like quantities. 
Quantities related only to time 
Time | Duration  s  s  second 
Count rate  s-1   [Events]/[Time]. 
Activity | Radioactivity  s-1 Bq  bequerel. [Events]/[Time]. 
Frequency of waves or events  s-1 Hz  hertz .
Frequency drift rate  s-2 Hz.s-1 [ΔFrequency]/[Time]. 
Phase drift rate  s-1 rad.s-1 [Phase angle]/[Time]. 
Angular velocity  s-1 rad.s-1 [Plane angle]/[Time]. 
Angular acceleration  s-2 rad.s-2 [ΔAngularVelocity]/[Time]. 
Settling rate  s-1 typically dB/s  [Ratio]/[ΔTime]. 
Log-scale evolution rate | Relative evolution rate  s-1   d{ln(Q)}/dt = (dQ/dt)/Q. 
Relaxation time  s    Used in all branches of Science. 
Relaxation rate  s-1   1/[Relaxation time]. 
Quantities related only to space 
Length  m  m  meter 
Distance | Position vector  m    in all Euclidean n-dimensional spaces. 
Area | Cross section  m2   [Distance]*[Distance]. 
Volume  m3   [Area]*[Distance] 
Curvature radius  m    of a line in plane/space or surface in space 
K-space vector  m-1   same as reciprocal space position. 
Convergence  m-1 dioptry  in optics, but not only ... 
Wavenumber  m-1   [Number of waves]/[Distance]. 
Wavelength  m    [Wave velocity]/[Frequency]. 
Propagation through media 
Attenuation  m-1 dB/m  Sonic, RF, ... attenuation. 
Transmission | Propagation loss  m-1 dB/m  [Ratio]/m. Used for any other quantity. 
Extinction coefficient  m-1 dB/m  Used mostly for radiation. 
Matter distribution and transport 
Mass  kg  kg  kilogram 
Specific density | Density of mass  kg.m-3   [Mass]/[Volume]. 
Specific volume  m3.kg-1   [Volume]/[Mass]. 
Number density  m-3   [Particles]/[Volume]. 
Number density, molar  mol-1   [Particles]/[Mol]. The Avogadro constant. 
Concentration | Molar concentration  m-3.mol   [Quantity]/[Volume]. Also density of substance 
Volume concentration  1  Dimensionless  [Volume of substance]/[Total volume] 
Mass | Weight concentration  1  Dimensionless  [Mass of substance]/[Total mass]. 
Molar mass  kg.mol-1   [Mass]/[Quantity] 
Molar density | Molarity | Molar concentration  m-3.mol   [Quantity]/[Volume]. 
Molality  kg-1.mol mol/kg  [Quantity]/[Mass]. 
Molar volume  m3.mol-1   [Volume]/[Quantity]. 
Mass flow | Mass production rate  kg.s-1   [ΔMass]/[Time]. 
Diffusion coefficient  m2.s-1   [Distance2]/[Time]. 
Katalytic activity | Molar production rate  mol.s-1 katal  [ΔQuantityOfSubstance]/[Time]. 
Kinematics 
Velocity | Speed  m.s-1   [Distance]/[Time] 
Drift speed  m.s-1   Steady-state speed of an object .
Acceleration, linear  m.s-2   [ΔVelocity]/[Time] 
Gravity and gravitation 
Gravitational field intensity | Gravity  m.s-2   [Force]/[Mass], Same as acceleration. 
Gravitational field potential  m2.s-2   [Energy]/[Mass].  
Mechanics 
Moment of motion  kg.m.s-1   [Mass]*[Velocity], [Mass flow]*[Distance]. 
Force  kg.m.s-2 N  newton. [Mass]*[Acceleration]. 
Impulse  kg.m.s-1   [ΔMoment of motion], [Force]*[ΔTime], [Mass]*[ΔVelocity]. 
Moment of force | Torque  kg.m2.s-2 N.m  [Force]*[Distance]. Same dimension as energy. 
Couple  kg.m2.s-2 N.m  2*[Force]*[Distance] for two non-aligned opposing forces. 
Pressure  kg.m-1.s-2 N.m-2, Pa pascal. [Force]/[Area]. 
Stress | Tension | Compression  kg.m-1.s-2 N.m-2, Pa (pascal) [Force]/[Area]. ... same as pressure 
Energy | Lagrangian | Hamiltonian  kg.m2.s-2 N.m, J  joule. [Force]*[Distance], [Power]*[Time]. 
Specific energy  m2.s-2 J.kg-1 [Energy]/[Mass]. 
Molar energy  kg.m2.s-2.mol-1 J.mol-1 [Energy]/[Quantity]. 
Energy density  kg.m-1.s-2 J.m-3 [Energy]/[Volume]. 
Power | Energy flux  kg.m2.s-3 J.s-1, W  watt. [ΔEnergy]/[ΔTime]. 
Action  kg.m2.s-1 J.s  [Energy]*[Time], [Moment of motion]*[Distance] 
Angular moment of inertia  kg.m2   [Mass]*[Distance2] 
Angular moment of motion  kg.m2.s-1 J.s  [Moment of motion]*[Distance] 
Circulation  m2.s-1 J.s.kg-1 [Angular moment]/[Mass], [Velocity]*[Loop length] 
Spin  1  Dimensionless  of a quantum particle 
Mean anomaly  1  Dimensionless  Of an body on a Kepler orbit; t.sqrt(G(M1+M2)/r3) 
Mean motion  s-1   Of an body on a Kepler orbit; sqrt(G(M1+M2)/r3) 
Friction  kg.m.s-2 N (newton)  Tangential force between two moving surfaces. 
Traction  kg.m.s-2 N  Maximum tangential force before slipping. 
Mechanical properties of matter 
Compressibility | Bulk modulus | Compression modulus  kg-1.m.s2 Pa-1 [Pressure]/([ΔVolume]/[Volume]). 
Constringence  1  Dimensionless  [Transversal striction]/[Londitudinal elongation]. 
Young modulus  kg.m-1.s-2 N.m-2, Pa [Stress]/([ΔLength]/[Length]). 
Shear modulus | Modulus of rigidity  kg.m.s-2 N, N.rad-1 [Force]/[ΔAngle]. 
Impact | Notch resistance  kg.s-2 J.m-2 [Energy]/[Area] 
Hardness | Tensile strength  kg.m-1.s-2 N.m-2, Pa [Force]/[Area]. Same dimension as pressure. 
Stiffness (linear)  kg.s-2 N.m-1 [Force]/[Displacement]. ... of a structure. 
Stiffness (rotational)  kg.m2.s-2.rad-1 N.m.rad-1 [Moment of force]/[Angle]. ... of a structure. 
Compressive strength  kg.m-1.s-2 N.m-2, Pa [Force]/[Area]. Same dimension as pressure. 
Friction coefficient  1  Dimensionless  [Tangential force]/[Normal force]. 
Traction coefficient  1  Dimensionless  [Traction]/[Weight]. 
Self-diffusion coefficient  m2.s-1   [Distance2]/[Time]. 
Surface tension  kg.s-2 N/m  [Force]/[Length]. Same as surface energy. 
Surface energy  kg.s-2 J/m2 [Energy]/[Area]. Same as surface tension. 
Viscosity, dynamic  kg.m-1.s-1 Pa.s  ([Force]/[Area])/[ΔVelocity] 
Viscosity, kinematic  m2.s-1   [Dynamic viscosity]/[Density] 
Reynolds number  1  Dimensionless  [Velocity]*[length]/[Kinematic viscosity] 
Critical angle of repose  rad  or degree  Steepest angle of a slope before a slide 
Thermodynamics 
Temperature  K  K  kelvin 
Temperature gradient | Thermal gradient  K.m-1   [ΔTemperature]/[Distance]. 
Heat | Internal energy | Enthalpy  kg.m2.s-2 J  Same as energy. 
Specific heat | internal energy | enthalpy  m2.s-2 J.kg-1 [Heat]/[Mass]. 
Molar heat | internal energy | enthalpy  kg.m2.s-2.mol-1 J.mol-1 [Heat]/[Quantity]. 
Heat capacity  kg.m2.s-2.K-1 J.K-1 [ΔHeat]/[ΔTemperature]. 
Heat flux  kg.m2.s-3 J.s, W  [ΔHeat]/[ΔTime]. Same as power. 
Heat flux density | Irradiance  kg.s-3 W.m-2 [Heat flux]/[Area]. 
Entropy  kg.m2.s-2.K-1 J.K-1 [ΔHeat]/[Temperature]. 
Specific entropy  m2.s-2.K-1 J.K-1.kg-1 [Entropy]/[Mass]. 
Molar entropy  kg.m2.s-2.K-1.mol-1 J.K-1.mol-1 [Entropy]/[Quantity]. 
Free energy | Free enthalpy  kg.m2.s-2 J  Helmholtz | Gibbs functions, respectively. 
Specific free energy | free enthalpy  m2.s-2 J.kg-1 [Energy]/[Mass]. Also specific Helmholtz | Gibbs functions 
Molar free energy | free enthalpy  kg.m2.s-2.mol-1 J.mol-1 [Energy]/[Quantity]. Molar versions of the above 
Thermodynamic and thermal properties of matter 
Thermal expansion coefficient  K-1   ([ΔLength]/[Length])/[Temperature]. 
Specific heat capacity  m2.s-2.K-1 J.K-1.kg-1 [Heat capacity]/[Mass]. 
Molar heat capacity  kg.m2.s-2.K-1.mol-1 J.K-1.mol-1 [Heat capacity]/[Quantity]. 
Heat conductivity  kg.m.s-3.K-1 W.m-1.K-1 [Heat flux]/([Distance]*[ΔTemperature]). 
Thermal diffusivity  m2.s-1   ([∂Temp]/[∂Time])/[∇2Temp].
Prandtl number  1  Dimensionless  [Kinematic viscosity]/[Thermal diffusivity]. 
Joule-Thomson coefficient  kg-1.m.s2.K K.Pa-1 [ΔTemperature]/[ΔPressure]. 
Pi coefficient, molar  kg.m-1.s-2.mol-1 J.m-3 [ΔInternalEnergy]/[ΔVolume]. 
Chemical potential, molar  kg.m2.s-2.mol-1 J.mol-1 [ΔInternalEnergy]/[ΔQuantityOfSubstance]. 
Softening point  K    Temperature at which hardness drops below a level. 
Annealing point  K    Temperature at which viscosity drops below 1012 Pa.s 
Strain point  K    Temperature at which viscosity drops below 1013.5 Pa.s 
Flash point  K    Temperature at which vapour can be kept burning 
Fire point  K    Temperature at which ignited vapour keeps burning 
Thermal properties of devices 
Thermal resistance  kg-1.m-2.s3K K/W  [ΔT]/[Power].
Electromagnetism 
Charge, electric  s.A  C  coulomb. [Current]*[Time] 
Charge density  m-3.s.A  C.m-3 [Charge]/[Volume] 
Current, electric  A  A  ampere. [Charge]/[Time] 
Current density | Current intensity  m-2.A   [Current]/[Area] 
Specific charge | Charge/mass ratio  kg-1.s.A  C.kg-1 [Charge]/[Mass] 
Molar charge  s.A.mol-1  C.mol-1 [Charge]/[Quantity] 
Quantum charge  1  Dimensionless  [Charge]/[Elementary charge quantum] 
Surface density of charge  m-2.s.A  C.m-2 [Charge]/[Area] 
Potential, electric  kg.m2.s-3.A-1 W.A-1, J.C-1, C.F-1, V volt. [Power]/[Current], [Energy]/[Charge] 
Electric dipole moment  m.s.A  C.m  [Charge]*[Distance] 
Electric quadrupole moment  m2.s.A  C.m2 [Electric dipole]*[Distance], [Electric charge]*[Distance2] 
Electric field strength | Electric intensity  kg.m.s-3.A-1 V.m-1 [ΔPotential]/[Distance]. 
Electric field gradient  kg.s-3.A-1 V.m-2 [ΔEl.field strength]/[Distance]. 
Electric flux density | Electric induction  m-2.s.A C.m-2 [Charge]/[Area]. 
Electric polarization  m-2.s.A C.m-2 [Charge]/[Area]. Same as electric flux density 
Magnetic field strength | Magnetic intensity  m-1.A   [Current]/[Distance]. 
Magnetization  m-1.A   [Magnetic moment]/[Volume]. As magnetic field strength 
Magnetic flux  kg.m2.s-2.A-1 V.s, W.s.A-1, Wb  weber. [ΔPotential]*[Time], [Power]/[dCurrent/dt] 
Magnetic flux density | Magnetic induction  kg.s-2.A-1 Wb.m-2, T  tesla. [Mag.flux]/[Area]. 
Vector potential  kg.m.s-2.A-1 V.s.m-1, T.m [Electric field strength]*[Time], [Mag.flux density]*[Distance] 
Poynting vector  kg.s-3 W.m-2 [El.field strength]/[Mag.field strength]. Same as irradiance 
Magnetic field gradient  kg.m-1.s-2.A-1 T.m-1 [ΔMagnetic flux density]/[Distance]. 
Magnetic dipole moment  m2.A J.T-1 [Current]*[Area]. Same as magnetic moment. 
Magnetic quadrupole moment  m3.A m.J.T-1 [Magnetic dipole]*[Distance] 
Gyromagnetic ratio  kg-1.s.A Hz.T-1 [Mag.moment]/[Angular moment of motion]. 
Magnetogyric ratio  kg.s-1.A-1 T.Hz-1 [Angular moment of motion]/[Mag.moment]. 
Electromagnetic properties of matter 
Resistivity  kg.m3.s-3.A-2 Ω.m  [Resistance]*[Length])/[Area]. 
Conductivity  kg-1.m-3.s3.A2 S.m-1 1/[Resistivity]. 
Permittivity, electric  kg-1.m-3.s4.A2 F.m-1 [El.flux density]/[El.field strength]. 
Dielectric constant | Relative permittivity  1  Dimensionless  [Permittivity]/[Permittivity of vacuum]. 
Permeability, magnetic  kg.m.s-2.A-2 N.A-2, H.m-1 [Mag.flux density]/[Mag.field strength]. 
Reluctance, magnetic  kg-1.m-1.s2.A2 m.H-1 1/[Permeability]. 
Relative permeability, magnetic  1  Dimensionless  [Permeability]/[Permeability of vacuum]. 
Susceptibility, magnetic  1  Dimensionless  [Relative permeability] - 1. 
Characteristic impedance  kg.m2.s-3.A-2 V.A-1, Ω, ohm  √([Mag.Permeability]/[El.Permittivity]). 
Electric | Dielectric strength | rigidity  kg.m.s-3.A-1 V.m-1 [ΔPotential]/[Distance]. 
Verdet constant  kg-1.m-1.s2.A1 rad.m-1.T-1 ([Angle]/[Length])/[Magnetic flux density] 
Work function  kg.m2.s-2 J, eV  [Energy] needed to remove an electron. 
Seeback coef. | Thermopower | Thermoelectric power  kg.m2.s-3.A-1.K-1 V.K-1 [ΔPotential]/[ΔTemperature]. 
Thomson coefficient  kg.m2.s-3.A-1.K-1 W.K-1.A-1 [Heat flux]/([ΔTemperature]*[Current]). 
Peltier coefficient  kg.m2.s-3.A-1 W.A-1, V [Heat flux]/[Current]. 
Piezzoelectric coefficient  kg.m.s-3.A-1 V.m-1 [El.field strength]/([ΔLength]/[Length]). 
Electrostriction coefficient  kg-2.m-2.s6.A2 m2.V-2 ([ΔVolume]/[Volume])/[El.field strength]2. 
g-factor of a particle  1  Dimensionless  [Mag.moment]/([Spin].[Bohr magneton]) 
Properties of electric/magnetic devices and circuit components 
Bandwidth  s-1 Hz  [ΔFrequency] 
Voltage | Electromotive force (emf)  kg.m2.s-3.A-1 V  [ΔPotential] 
Current, electric  A  A  ampere. [Charge]/[Time] 
Magnetomotive force (mmf)  A    [Current]*[Number of turns] 
Impedance, of a circuit  kg.m2.s-3.A-2 Ω  ohm 
Admittance, of a circuit  kg-1.m-2.s3.A2 S  siemens. 1/[Circuit impedance]. 
Resistance  kg.m2.s-3.A-2 V.A-1, Ω(ohm)  [ΔPotential]/[Current] 
Conductance  kg-1.m-2.s3.A2 A.V-1, S (siemens)  1/[Resistance]. 
Capacitance  kg-1.m-2.s4.A2 C.V-1, F  farad. [Charge]/[ΔPotential] 
Reactance, capacitive  kg.m2.s-3.A-2 Ω (ohm)  1/(i[Angular frequency].[Capacitance]) 
Susceptance, capacitive  kg-1.m-2.s3.A2 S (siemens)  1/[Reactance]. 
Inductance | Mutual inductance  kg.m2.s-2.A-2 V.s.A-1, Wb.A-1, H  henry. [ΔPotential]/[dCurrent/dt] or [Magnetic flux]/[Current] 
Impedance, inductive  kg.m2.s-3.A-2 Ω (ohm)  i[Angular frequency].[Inductance] 
Admittance, inductive  kg-1.m-2.s3.A2 S (siemens)  1/[Inductive impedance]. 
Number of turns  1    Applicable to coils, transformers, etc. 
Current noise, variance nJ2  s.A2 A2/Hz [Current]2/[Bandwidth]
Voltage noise, variance nV2  kg2.m4.s-5.A-2 V2/Hz [Voltage]2/[Bandwidth]
Optics 
Albedo, of a surface  1  Dimensionless  [Reflected elmag power]/[Incident elmag power] 
Convergence  m-1 dioptry  dioptry 
Luminosity | Luminous intensity  cd  cd  candle or lumen/sr 
Luminous flux | Luminous power  cd.sr  lm  lumen. [Luminosity]*[Solid angle]. 
Luminance  cd.m-2   [Luminosity]/[Area] 
Luminous energy  cd.sr.s  lm.s  [Luminous flux]*[Time]. Also known as talbot 
Illuminance  cd.sr.m-2 lm.m-2, lx  lux. [Luminous flux]/[Area]. 
Luminous emittance  cd.sr.m-2 lm.m-2, lx  lux. Same as illuminance, but for sources 
Luminous efficacy  cd.sr.kg-1.m-1.s3 lm/W  [Luminous flux]/[Power] 
Luminous efficiency | Luminous coefficient  1  Dimensionless  [Luminous efficacy]/[683 lm/W]. 
Irradiance  kg.s-3 W.m-2 [Power]/[Area]. For all kinds of energy deposition 
Radiance  kg.s-3.sr-1 W.m-2.sr-1 ([Power]/[Area])/[Solid angle] 
Optical properties of matter 
Extinction coefficient  m-1    
Refractive index  1  Dimensionless  Light speeds ratio (in medium)/(in vacuum) 
Specific refractivity  m3.kg-1   [(r2-1)/(r2+2)]/[Specific density], where r is refractive index 
Molar refractivity  m3.mol-1   [(r2-1)/(r2+2)]/[Concentration] 
Dispersivity quotient  m-1   [ΔRefractive index]/[ΔWavelength] 
Dispersive power  1  Dimensionless  Ratio of differences of refractive indices. 
Abbé number  1  Dimensionless  Inverse of refractive index. 
Star magnitude (astronomy)  1  Dimensionless  m-m'= -100.4(S/S'). S,S' are luminous fluxes of two stars 
Chemistry and physical chemistry. 
Concentration | Molar density | Molarity  m-3.mol   [Quantity]/[Volume]. Also called Density of substance 
Molality  kg-1.mol mol/kg  [Quantity]/[Mass]. 
Katalytic activity | Molar production rate  mol.s-1 katal  [Quantity]/[Time]. 
Molar mass  kg.mol-1   [Mass]/[Quantity] 
Molar charge  s.A.mol-1  C.mol-1 [Charge]/[Quantity] 
Molecular | ionic quantum charge  1  Dimensionless  [Charge of a molecule or ion]/[Elementary charge quantum] 
Ionic strength | Ionic force  m-3.mol   Sum([Conc.]*[Ionic quantum charge]2)
Ion mobility  kg-1.m-1.s2.A m2.s-1.V-1  [Velocity]/[Electric field strength] .
Drift speed  m.s-1   Steady-state speed of ions in electric field .
Fugacity  kg.m-1.s-2 Pa  Effective pressure in real gases. 
Osmotic pressure  kg.m-1.s-2 Pa  
Electronegativity, Pauling χ  1  Dimensionless  Relative tendency of an atom to attract electrons; χ(H)=2.20.  
Thermodynamic force  kg.m.s-2.mol-1 N/mol  [ΔChemical potential]/[Distance] 
Chemico-physical properties of matter 
Molar volume  m3.mol-1   [Volume]/[Quantity]. 
Chemical potential, molar  kg.m2.s-2.mol-1 J.mol-1 [ΔInternalEnergy]/[ΔQuantityOfSubstance]. 
Solubility, molar  m-3.mol   [Quantity]/[Volume]. 
Reduction | Redox potential  kg.m2.s-3.A-1 V (volt)   
Molar conductivity  kg-1.s3.A2.mol-1 S.m2.mol-1 [El.conductivity]/[Concentration]. 
Molar relaxivity  m3.s-1.mol-1   [Relaxation rate]/[Concentration]. 
Ebullioscopic constant  kg.mol-1.K K/(mol/kg)  [ΔTemperature]/[Molality]. 
Cryoscopic constant  kg.mol-1.K K/(mol/kg)  [ΔTemperature]/[Molality]. 
van der Waals constant: a  kg.m5.s-2 Pa.m6 a in (p+a/V2)(V-b)=RT.
van der Waals constant: b  m3   b in (p+a/V2)(V-b)=RT.
van der Waals virial constant: A  kg-1.m5.s-2.mol-2   A in p=(n/V)RT+(n/V)2(RTB-A).
van der Waals virial constant: B  kg-1.m3.mol-1   B in p=(n/V)RT+(n/V)2(RTB-A).
Virial coefficient: second  kg.m5.s-2.mol-2 Pa.(mol.m-3)-2 A in p=(n/V)RT+A(n/V)2+B(n/V)3+C(n/V)4.
Virial coefficient: third  kg.m8.s-2.mol-3 Pa.(mol.m-3)-3 B in p=(n/V)RT+A(n/V)2+B(n/V)3+C(n/V)4.
Virial coefficient: fourth  kg.m11.s-2.mol-4 Pa.(mol.m-3)-4 C in p=(n/V)RT+A(n/V)2+B(n/V)3+C(n/V)4.
Radiation and radioactivity. 
Irradiance  kg.s-3 W.m-2 [Power]/[Area]. For all kinds of energy deposition. 
Activity | Radioactivity  s-1 Bq  bequerel. [Events]/[Time]. 
Absorbed dose  m2.s-2 J.kg-1, Gy  gray. [Energy]/[Mass]. 
Absorbed dose rate  m2.s-3 Gy.s-1 [Absorbed dose]/[Time]. 
Absorbed dose equivalent  m2.s-2 J.kg-1, Sv  sievert. [const].[Energy]/[Mass]. 
Exposure  kg-1.s.A C.kg-1 [Charge]/[Mass]. For ionising radiations. 
Radiation properties of matter 
Half life  s    typically of a radioactive substance 
Informatics 
Information  bit-1 bit  bit; the elementary information quantum. 
Baud rate | Information flux  bit.s-1 Baud  baud. [Information]/[Time]. 
Operators 
d/dt  s-1    
dp/dtp s-p   For p = 1,2,3,... 
∇ | div | grad | rot | curl  m-1   Any derivative with respect to a distance. 
2 | Laplacian | D'Allembertian m-2    
dp/drp m-p   For p = 1,2,3,... [r] is a Length. 

Notes:
- bold magenta symbols in the alternatives column indicate quantities defined by the SI system.
- square brackets stand for dimension of the quantity they enclose.
- abbreviations El. and Mag. stand for Electric and Magnetic, respectively.
- [Quantity] stands for [Quantity of substance].
- Names of units are written with small first letter, even when derived from names of persons.

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Copyright ©2005,2006 Stanislav Sýkora    DOI: 10.3247/SL1Phys06.004 Designed by Stan Sýkora