SI Dimensions of Physical Quantities listed by Category

 SI Dimensions of Physical Quantities listed by Category

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  Pseudo-dimensional quantities:  Plane angle  1  rad  radian  Solid angle  1  sr  steradian  Universal dimensionless quantities  Count of events | Number of instances  1    This covers all kinds of enumerations  Probability of an event  1    Real number in a dimensionless interval [0,1]  Ratio of commensurable quantities  1    Q1/Q2, with Q1 and Q2 having the same dimension  Relative variation  1    ΔQ/Q, for any quantity Q  Logarithmic ratio logb(A/A') in any base b  1    Applicable to any ratio of commensurable quantities  Logarithmic scale differential | Relative differential  1    d{ln(Q)} = dQ/Q, for any quantity Q  Pseudo-dimensional quantities:  Phase | Phase angle  1  rad  φ typically in exp(i(ωt+φ))  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 or Loss of a device  1  usually in dB  [Output]/[Input], provided they are commensurable quantities  Attenuation | Amplification (generic)   1  usually in dB  [Quantity(p)]/[Quantity(p')], with p being some parameter  Logarithmic ratio ln(A/A')  1  Np  Neper. Uses natural logarithm  Logarithmic scale probability density  1  1/Np  [Probability]/[Natural-logarithmic ratio]  Operators  Derivative with respect to time  s-1   d/dt, ∂/∂t  Derivative with respect to a length  m-1   d/dr, ∂/∂r, r = x | y | z  Nabla ( ∇ ) | div | grad | rot | curl  m-1   Any derivative-like construct with respect to a distance  Laplace operator | Laplacian m-2   ∇2 = ∂2/∂x2 + ∂2/∂y2 + ∂2/∂z2  D'Alembert operator | D'Alembertian  m-2   (1/c2)∂2/∂t2 - ∂2/∂x2 - ∂2/∂y2 - ∂2/∂z2  Multiple derivatives with respect to time  s-p   dp/dtp, ∂p/∂tp; for p = 1,2,3,..  Multiple derivatives with respect to a length  m-p   dp/drp, ∂p/∂rp; for p = 1,2,3,..., r = x | y | z  Quantities related only to time  Time | Duration  s  s  second  Half life  s    of a non-conservative / decaying quantity  Settling time  s  typically dB/s  Used to describe transient phenomena  Relaxation time  s    Used for returns to equilibria  Activity | Frequency of events  s-1   [Counts]/[Time]  Count rate | Expectation frequency  s-1   [Counts]/[Time]  Relative growth rate  s-1   [Relative variation]/[Time]  Relative evolution rate | Log-scale evolution rate  s-1   d{ln(Q)}/dt = (dQ/dt)/Q  Settling rate  s-1 typically dB/s  [Ratio]/[ΔTime]. Used for transient phenomena  Relaxation rate  s-1   1/[Relaxation time]  Frequency of waves  s-1 Hz  hertz  Phase drift rate  s-1 rad.s-1 [Phase angle]/[Time]  Angular velocity / speed  s-1 rad.s-1 [Plane angle]/[Time]  Frequency drift rate  s-2 Hz.s-1 [ΔFrequency]/[Time]. Applicable to waves  Angular acceleration / deceleration  s-2 rad.s-2 [ΔAngularVelocity]/[Time]  Quantities related only to space  Position vector  m    in all Euclidean n-dimensional spaces  Length | Distance  m  m  meter  Perimeter | Circumference | Radius  m      Thickness  m    usually referred to planar structures  Wavelength  m    [Wave velocity]/[Frequency]  Wavenumber  m-1   [Number of waves]/[Distance]  K-space vector | Reciprocal space position  m-1     Curvature radius  m    of a line in plane/space or surface in space  Curvature  m-1   1/[Curvature radius]  Convergence  m-1 dioptry  used in optics, but not only ..  Attenuation / amplification over a distance  m-1 dB/m  [Attenuation]/[Distance]. Mostly in acoustic and electronics  Extinction coefficient  m-1 dB/m  [Ratio]/m. Used mostly for radiation  Propagation / transmission loss  m-1 dB/m  [Ratio]/m. Generic, usable for any quantity  Area | Cross section  m2   [Distance]*[Distance]  Surface element | Surface area  m2   [Distance]*[Distance]. Applicable to 3D bodies  Volume element | Volume  m3   [Area]*[Distance]  Propagation through space and time  Velocity | Speed  m.s-1   [Distance]/[Time]  Acceleration | Deceleration  m.s-2   [ΔVelocity]/[ΔTime]  Drift speed  m.s-1   Steady-state speed of an object  Surface / area growth rate  m2.s-1   [ΔArea]/[Time]  Volume growth rate  m3.s-1   [ΔVolume]/[Time]. For example, of a crystal  Volume flow  m3.s-1   [Volume]/[Time]. For example, through a device  Matter distribution and transport  Particle density  m-3   [Count]/[Volume]. Obsolete: number density  Mass  kg  kg  kilogram  Mass production rate  kg.s-1   [ΔMass]/[Time]  Mass density | Specific density  kg.m-3   [Mass]/[Volume]  Mass density gradient | Specific density gradient  kg.m-4   [Mass density]/[Distance]  Specific volume  m3.kg-1   [Volume]/[Mass]  Concentration ratio by volume  1  Dimensionless  [Partial volume]/[Total volume]  Concentration ratio by mass  1  Dimensionless  [Partial mass]/[Total mass]. Not by weight: obsolete)  Mass flow (total)  kg.s-1   [ΔMass]/[Time]. For example, through a device  Diffusion coefficient  m2.s-1   [Distance2]/[Time]  Molar distribution and transport quantities:  Particle count, molar  mol-1   [Count]/[Mol]. For example, the Avogadro constant  Molar production rate  mol.s-1   [ΔQuantity]/[Time]  Molar mass  kg.mol-1   [Mass]/[Quantity]  Molar volume  m3.mol-1   [Volume]/[Quantity]  Molar density | Density of substance  m-3.mol   [Quantity]/[Volume]  Molarity | Concentration  m-3.mol   [Quantity]/[Volume]. Same as molar density  Molarity gradient | Concentration gradient  m-4.mol   [Molarity]/[Distance]  Molar concentration ratio  1  Dimensionless  [Partial quantity]/[Total quantity]  Molality (intended as concentration)  kg-1.mol mol/kg  [Quantity]/[Mass]. Obsolete  Katalytic activity  mol.s-1 katal  [ΔQuantity]/[Time]  Mechanics and hydrodynamics  Force  kg.m.s-2 N  newton. [Mass]*[Acceleration]  Moment of motion  kg.m.s-1   [Mass]*[Velocity], [Mass flow]*[Distance]  Impulse  kg.m.s-1   [ΔMoment of motion], [Force]*[ΔTime], [Mass]*[ΔVelocity]  Moment of force | Torque  kg.m2.s-2 N.m  [Force]*[Distance]. Like 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]  Pressure gradient  kg.m-2.s-2 N.m-3, Pa/m [Pressure]/[Distance]  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]  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  Stress | Tension | Compression  kg.m-1.s-2 N.m-2, Pa (pascal) [Force]/[Area]. ... same as pressure  Compressive strength  kg.m-1.s-2 N.m-2, Pa [Force]/[Area]. Like pressure  Strain (mechanical)  1  Dimensionless  [ΔLength]/[Length] Relative deformation  Friction  kg.m.s-2 N  Tangential force between two moving surfaces  Traction  kg.m.s-2 N  Maximum tangential force before slipping  Velocity, superficial  m.s-1 m/s  In porous media; as if the space was filled only by the fluid  Velocity, advection  m.s-1 m/s  In porous media; actual progress along pressure gradient  Wave function for N particles (quantum)  m-3N/2 tentative  |ψ|2dτN is a dimensionless probability element. Mechanical and hydrodynamic properties of matter  Compressibility | Modulus of compression  kg-1.m.s2 Pa-1 [Pressure]/([ΔVolume]/[Volume]). Inverse of bulk modulus  Bulk modulus  kg.m-1.s-2 N.m-2, Pa ([ΔVolume]/[Volume])/[Pressure]. Inverse of compressibility  Young modulus  kg.m-1.s-2 N.m-2, Pa [Stress]/[Strain]. Like shear modulus  Shear modulus | Modulus of rigidity  kg.m-1.s-2 N.m-2, Pa [Stress]/[Strain]. Same dimension aas Young modulus  Poisson's ratio  1  Dimensionless  [Transversal striction]/[Londitudinal elongation]  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]. Like 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  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  Porosity, volume  1  Dimensionless  [Volume of pores]/[Total volume], in porous media  Porosity, superficial  1  Dimensionless  [Void cross section]/[Total cross section], in porous media  Permeability, hydraulic  m2 1 darcy = 10-12 m2 [Velocity]*[Viscosity]/[Pressure gradient], in porous media  Conductivity, hydraulic  m.s-1 m/s  Used for porous media  Specific acoustic impedance / resistance / reactance  kg.m-2.s-1 Pa.s/m , reyl [ΔPressure]*[Velocity], intensive property  Specific acoustic conductance / susceptance  kg-1.m2.s reyl-1 Inverse of specific acoustic impedance  Acoustic impedance / resistance / reactance  kg.m-4.s-1 Pa.s/m3, reyl/m2 [ΔPressure]/[Volume flow rate], extensive property  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]  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]  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 thermodynamical quantities:  Molar heat | internal energy | enthalpy  kg.m2.s-2.mol-1 J.mol-1 [Heat]/[Quantity]  Molar energy  kg.m2.s-2.mol-1 J.mol-1 [Energy]/[Quantity]  Molar entropy  kg.m2.s-2.K-1.mol-1 J.K-1.mol-1 [Entropy]/[Quantity]  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]  Heat capacity, specific  m2.s-2.K-1 J.K-1.kg-1 [Heat capacity]/[Mass]  Heat capacity, molar  kg.m2.s-2.K-1.mol-1 J.K-1.mol-1 [Heat capacity]/[Quantity]  Heat of fusion | evaporation, specific  m2.s-2 J.kg-1 [Energy]/[Mass]  Heat of fusion | evaporation, molar  kg.m2.s-2.mol-1 J.mol-1 [Energy]/[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]/[ΔQuantity]  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 | Electric displacement  m-2.s.A C.m-2 [Charge]/[Area]. Same as electric flux density  Magnetic field strength | Magnetic intensity  m-1.A   [Current]/[Distance]  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]  Magnetic vector potential  kg.m.s-2.A-1 m-1.s.V, m.T [Mag.flux density]*[Distance], [El.field strength]*[Time]  Magnetization  m-1.A   [Magnetic moment]/[Volume]. Like magnetic field strength  Magnetic charge (bound)  m-2.A   - ∇.[Magnetization] , -Divergence of magnetization  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]  Relativistic four-current (Jα)  m-2.A   Like current density and [Charge]*[c]  Relativistic four-potential (Aα)  kg.m.s-2.A-1 m-1.s.V, m.T Like magnetic vector potential and [El.potential]/[c]  Relativistic electromagnetic field tensor (Fμν)  kg.s-2.A-1 T  Like magnetic flux density  Relativistic displacement four-tensor (Dμν)  m-1.A   Like magnetic intensity  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  Thermoelectric power | Thermopower  kg.m2.s-3.A-1.K-1 V.K-1 [ΔPotential]/[ΔTemperature]  Seeback coefficient  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] Chemistry, physical chemistry, atomic and molecular physics  Concentration | Molar density | Molarity  m-3.mol   [Quantity]/[Volume]. Same as 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   Thermodynamic force  kg.m.s-2.mol-1 N/mol  [ΔChemical potential]/[Distance]  Chemico-physical properties of elements  Atomic number  1  Dimensionless  Number of protons in an atomic nucleus  Atomic weight | Relative atomic mass  au  atomic units  Average over a typical isotopic composition  Mass number of an isotope  1  Dimensionless  Number of protons+neutrons in the isotope nuclide  Electronegativity, Pauling χ  1  Dimensionless  Relative tendency of an atom to attract electrons; χ(H)=2.20.   Electron affinity (always molar)  kg.m2.s-2.mol-1 J.mol-1 Energy released when binding an electron  Chemico-physical properties of matter  Ionization energy, molar  kg.m2.s-2.mol-1 J.mol-1 Energy to ionize a molecule/atom  Volume, molar  m3.mol-1   [Volume]/[Quantity]  Heat of fusion | evaporation, molar  kg.m2.s-2.mol-1 J.mol-1 [Energy]/[Quantity]  Chemical potential, molar  kg.m2.s-2.mol-1 J.mol-1 [ΔInternalEnergy]/[ΔQuantity]  Solubility, molar  m-3.mol   [Quantity]/[Volume]  Reduction | Redox potential  kg.m2.s-3.A-1 V (volt)    Conductivity, molar  kg-1.s3.A2.mol-1 S.m2.mol-1 [El.conductivity]/[Concentration]  Relaxivity, molar  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]  Compression factor of a real gas  1  Dimensionless  pV/(nRT). For ideal gas equals 1; temperature dependent  van der Waals constant: a  kg.m5.s-2.mol-2 Pa.m6 a in (p+a/V2)(V-b)=RT, where V is molar volume van der Waals constant: b  m3.mol-1   b in (p+a/V2)(V-b)=RT, where V is molar volume Virial coefficient: second  m3.mol-1   B in pV/(nRT)=1+B(n/V)+C(n/V)2+D(n/V)3+... Virial coefficient: third  m6.mol-2   C in pV/(nRT)=1+B(n/V)+C(n/V)2+D(n/V)3+... Virial coefficient: fourth  m9.mol-3   C in pV/(nRT)=1+B(n/V)+C(n/V)2+D(n/V)3+... Gravitation, Astronomy, Cosmology  Gravitational field intensity | Gravity  m.s-2   [Force]/[Mass], Same as acceleration  Gravitational field potential  m2.s-2   [Energy]/[Mass]  Gravitational constant G  kg-1.m3.s-2   [Force]*[Distance]2/[Mass]2. Appears in Newton's equation  Mean motion  s-1   Of a body on a Kepler orbit; sqrt(G(M1+M2)/r3)  Mean anomaly  1  Dimensionless  Of a body on a Kepler orbit; t.sqrt(G(M1+M2)/r3)  Star magnitude (astronomy)  1  Dimensionless  m-m'= -100.4(S/S'). S,S' are luminous fluxes of two stars  Cosmological constant Λ  m-2   Appears in Einstein's equation  Cosmological expansion rate  s-1 km/s/Mpc  [Velocity]/[Distance]. Mpc stands for Megaparsec  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  Constringence | Abbé number | V-number  1  Dimensionless  VD = (nD-1)/(nF-nC)  Radiation and radioactivity  Radioactivity | Activity  s-1 Bq  bequerel. [Counts]/[Time]  Irradiance  kg.s-3 W.m-2 [Power]/[Area]. For all kinds of energy deposition  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    Of a radioisotope  Radiation power  m2.s-3 W/kg  [Power]/[Mass]. Heat generated by a radioisotope  Radiation power, molar  kg.m2.s-3.mol-1 W/mol  [Power]/[Quantity]. Heat generated by a radioisotope  Informatics  Information  bit-1 bit  bit; the elementary information quantum  Baud rate | Information flux  bit.s-1 Baud  baud. [Information]/[Time]  Economy and finance  Transactions count  1  Dimensionless  All kinds of counts  Interest  1  %  [ΔWealth]/[Wealth]. Usually expressed as percentage  Wealth | Asset  cur  currency  Currencies like $, EUR, Yuan, ... are different units  Debt | Liability  cur  currency  Usually intended as negative wealth  Value | Price  cur  currency  Prefixes: K..thousands, M..millions, B..billions  Transaction value | Sale | Purchase  cur  currency  Often used: mean and total values  Time period  s  year,quarter,month  Abbrevs: mrq.. most recent quarter, ttm.. trailing twelve months  Fiscal year | Calendar year  s  year  Abbrevs: lfy.. last fiscal year, yoy.. year over year  Transactions rate | Activity  s-1 1/year  [Transactions]/[Time period]  Transactions volume | Sales flow  cur.s-1   [Value]/[Time period]. For example $/day or Eur/year  Velocity / circulation of money  s-1 1/year  [Transactions]/[Time period]  Interest rate  s-1 %/year  [Interest]/[Time period]  Return on asset / equity  s-1 %/year  ([ΔValue]/[Value])/[Time period]  Cash flow | Flow (generic)  cur.s-1 currency/year  [Value]/[ΔTime]. Mathematically, time derivative  Earnings | Income rate  cur.s-1 currency/year  [Value]/[Time period]  GDP Gross domestic product  cur.s-1 currency/year  [Earnings]. Usually refered to nations/states/admin.regions  Debt/GDP ratio  s year  [Debt]/[Earnings]. Independent of currency / population size  P/E Price/Earnings ratio  s year  [Value]/[Earnings]. Used to assess an asset/company  Bond duration  s year  In general, the duration of a fixed cash flow