List of physical quantities
This is a list of physical quantities. The first table lists the base quantities used in the International System of Units to define the physical dimension of physical quantities for dimensional analysis. The second table lists the derived physical quantities. Derived quantities can be mentioned in terms of the base quantities.
Note that neither the names nor the symbols used for the physical quantities are international standards. Some quantities are known as several different names such as the magnetic Bfield which known as the magnetic flux density, the magnetic induction or simply as the magnetic field depending on the context. Similarly, surface tension can be denoted by either σ, γ or T. The table usually lists only one name and symbol.
The final column lists some special properties that some of the quantities have, such as their scaling behavior (i.e. whether the quantity is intensive or extensive), their transformation properties (i.e. whether the quantity is a scalar, vector or tensor), and whether the quantity is conserved.
Base quantity  Symbol  Description  SI base unit  Dimension  Comments 

Length  l  The onedimensional extent of an object  metre (m)  L  
Mass  m  A measure of resistance to acceleration  kilogram (kg)  M  extensive, scalar 
Time  t  The duration of an event  second (s)  T  scalar 
Electric Current  I  Rate of flow of electrical charge per unit time  ampere (A)  I  
Temperature  T  Average potential energy per degree of freedom of a system  kelvin (K)  Θ  intensive, vector 
Amount of substance  n

Number of particles compared to the number of atoms in 0.012 kg of ^{12}C  mole (mol)  N  extensive, scalar 
Luminous intensity  L  Wavelengthweighted power of emitted light per unit solid angle  candela (cd)  J  scalar 
Derived quantity  Symbol  Description  SI derived unit  Dimension  Comments 

Absement  A  Measure of sustained displacement: the first integral of displacement  m⋅s  L T  vector 
Absorbed dose rate  Absorbed dose received per unit of time  Gy/s  L^{2} T^{−3}  
Acceleration  a→  Rate of change of velocity per unit time: the second time derivative of position  m/s^{2}  L T^{−2}  vector 
Angular acceleration  ω_{a}  Change in angular velocity per unit time  rad/s^{2}  T^{−2}  
Angular momentum  L  Measure of the extent and direction an object rotates about a reference point  kg⋅m^{2}/s  M L^{2} T^{−1}  conserved quantity, pseudovector 
Angular velocity  ω  The angle incremented in a plane by a segment connecting an object and a reference point per unit time  rad/s  T^{−1}  scalar or pseudovector 
Area  A  Extent of a surface  m^{2}  L^{2}  scalar 
Area density  ρ_{A}  Mass per unit area  kg⋅m^{−2}  M L^{−2}  
Capacitance  C  Stored charge per unit electric potential  farad (F = C/V)  M^{−1} L^{−2} T^{4} I^{2}  scalar 
Catalytic activity  Change in reaction rate due to presence of a catalyst  katal (kat = mol⋅s^{−1})  T^{−1} N  
Catalytic activity concentration  Change in reaction rate due to presence of a catalyst per unit volume of the system  kat⋅m^{−3}  L^{−3} T^{−1} N  
Chemical potential  μ  Energy per unit change in amount of substance  J/mol  M L^{2} T^{−2} N^{−1}  intensive 
Crackle  c→  Change of jounce per unit time: the fifth time derivative of position  m/s^{5}  L T^{−5}  vector 
Current density  J →  Electric current per unit crosssection area  A/m^{2}  L^{−2} I  vector 
Dose equivalent  H  Received radiation adjusted for the effect on biological tissue  sievert (Sv = m^{2}/s^{2})  L^{2} T^{−2}  
Dynamic viscosity  v  Measure for the resistance of an incompressible fluid to stress  Pa⋅s  M L^{−1} T^{−1}  
Electric charge  Q  The force per unit electric field strength  coulomb (C = A⋅s)  T I  extensive, conserved quantity 
Electric charge density  ρ_{Q}  Electric charge per unit volume  C/m^{3}  L^{−3} T I  intensive 
Electric displacement  D→  Strength of the electric displacement  C/m^{2}  L^{−2} T I  vector field 
Electric field strength  E→  Strength of the electric field  V/m  M L T^{−3} I^{−1}  vector field 
Electrical conductance  G  Measure for how easily current flows through a material  siemens (S = Ω^{−1})  M^{−1} L^{−2} T^{3} I^{2}  scalar, reproducible 
Electrical conductivity  σ  Measure of a material's ability to conduct an electric current  S/m  M^{−1} L^{−3} T^{3} I^{2}  scalar 
Electric potential  φ  Energy required to move a unit charge through an electric field from a reference point  volt (V = J/C)  M L^{2} T^{−3} I^{−1}  extensive, scalar 
Electrical resistance  R  Electric potential per unit electric current  ohm (Ω = V/A)  M L^{2} T^{−3} I^{−2}  extensive, scalar, assumes linearity 
Electrical resistivity  ρ_{e}  Bulk property equivalent of electrical resistance  ohmmetre (Ω⋅m)  M L^{2} T^{−2}  extensive, scalar, conserved quantity 
Energy  ._{.}  Energy  J  M L^{2} T^{−2}  
Energy density  ρ_{E}  Energy per unit volume  J⋅m^{−3}  M L^{−1} T^{−2}  intensive 
Entropy  S  Logarithmic measure of the number of available states of a system  J/K  M L^{2} T^{−2} Θ^{−1}  extensive, scalar 
Force  F→  Transfer of momentum per unit time  newton (N = kg⋅m⋅s^{−2})  M L T^{−2}  extensive, vector 
Frequency  f  Number of (periodic) occurrences per unit time  hertz (Hz = s^{−1})  T^{−1}  scalar 
Fuel efficiency  Distance traveled per unit volume of fuel  m/m^{3}  L^{−2}  scalar  
Halflife  t_{1/2}  Time for a quantity to decay to half its initial value  s  T  
Heat  Q  Thermal energy  joule (J)  M L^{2} T^{−2}  
Heat capacity  C_{p}  Energy per unit temperature change  J/K  M L^{2} T^{−2} Θ^{−1}  extensive 
Heat flux density  ϕ_{Q}  Heat flow per unit time per unit surface area  W/m^{2}  M T^{−3}  
Illuminance  E_{v}  Luminous flux per unit surface area  lux (lx = cd⋅sr/m^{2})  L^{−2} J  
Impedance  Z  Resistance to an alternating current of a given frequency, including effect on phase  ohm (Ω)  M L^{2} T^{−3} I^{−2}  complex scalar 
Impulse  J  Transferred momentum  newtonsecond (N⋅s = kg⋅m/s)  M L T^{−1}  vector 
Inductance  L  Magnetic flux generated per unit current through a circuit  henry (H)  M L^{2} T^{−2} I^{−2}  scalar 
Irradiance  E  Electromagnetic radiation power per unit surface area  W/m^{2}  M T^{−3}  
Intensity  I  Power per unit cross sectional area  W/m^{2}  I  
Jerk  j→  Change of acceleration at the unit time: the third time derivative of position  m/s^{3}  L T^{−3}  vector 
Jounce (or snap)  s→  Change of jerk per unit time: the fourth time derivative of position  m/s^{4}  L T^{−4}  vector 
Linear density  ρ_{l}  Mass per unit length  kg⋅m^{−1}  M L^{−1}  
Luminous flux (or luminous power)  F  Perceived power of a light source  lumen (lm = cd⋅sr)  J  
Mach number (or mach)  M  Ratio of flow velocity to the local speed of sound  unitless  1  
Magnetic field strength  H  Strength of a magnetic field  A/m  L^{−1} I  vector field 
Magnetic flux  Φ  Measure of magnetism, taking account of the strength and the extent of a magnetic field  weber (Wb)  M L^{2} T^{−2} I^{−1}  scalar 
Magnetic flux density  B  Measure for the strength of the magnetic field  tesla (T = Wb/m^{2})  M T^{−2} I^{−1}  pseudovector field 
Magnetization  M  Amount of magnetic moment per unit volume  A/m  L^{−1} I  vector field 
Mass fraction  x  Mass of a substance as a fraction of the total mass  kg/kg  1  intensive 
(Mass) Density (or volume density)  ρ  Mass per unit volume  kg/m^{3}  M L^{−3}  intensive 
Mean lifetime  τ  Average time for a particle of a substance to decay  s  T  intensive 
Molar concentration  C  Amount of substance per unit volume  mol⋅m^{−3}  L^{−3} N  intensive 
Molar energy  Amount of energy present in a system per unit amount of substance  J/mol  M L^{2} T^{−2} N^{−1}  intensive  
Molar entropy  Entropy per unit amount of substance  J/(K⋅mol)  M L^{2} T^{−2} Θ^{−1} N^{−1}  intensive  
Molar heat capacity  c  Heat capacity of a material per unit amount of substance  J/(K⋅mol)  M L^{2} T^{−2} Θ^{−1} N^{−1}  intensive 
Moment of inertia  I  Inertia of an object with respect to angular acceleration  kg⋅m^{2}  M L^{2}  tensor, scalar 
Momentum  p→  Product of an object's mass and velocity  kg⋅m/s  M L T^{−1}  vector, extensive 
Permeability  μ_{s}  Measure for how the magnetization of material is affected by the application of an external magnetic field  H/m  M L T^{−2} I^{−2}  intensive 
Permittivity  ε_{s}  Measure for how the polarization of a material is affected by the application of an external electric field  F/m  M^{−1} L^{−3} T^{4} I^{2}  intensive 
Plane angle  θ  Ratio of circular arc length to radius  radian (rad)  1  
Power  P  Rate of transfer of energy per unit time  watt (W)  M L^{2} T^{−3}  extensive, scalar 
Pressure  p  Force per unit area  pascal (Pa = N/m^{2}  M L^{−1} T^{−2}  intensive, scalar 
Pop  p→  Rate of change of crackle per unit time: the sixth time derivative of position  m/s^{6}  L T^{−6}  vector 
(Radioactive) Activity  A  Number of particles decaying per unit time  becquerel (Bq = Hz)  T^{−1}  extensive, scalar 
(Radioactive) Dose  D  Ionizing radiation energy absorbed by biological tissue per unit mass  gray (Gy = m^{2}/s^{2})  L^{2} T^{−2}  
Radiance  L  Power of emitted electromagnetic radiation per unit solid angle per emitting source area  W/(m^{2}⋅sr)  M T^{−3}  
Radiant intensity  I  Power of emitted electromagnetic radiation per unit solid angle  W/sr  M L^{2} T^{−3}  scalar 
Reaction rate  r  Rate of a chemical reaction for unit time  mol/(m^{3}⋅s)  N L^{−3} T^{−1}  intensive, scalar 
Refractive index  n  Factor by which the phase velocity of light is reduced in a medium  unitless  1  intensive, scalar 
Reluctance  resistance to the flow of magnetic flux  H^{−1}  M^{−1} L^{−2} T^{2} I^{2}  scalar  
Solid angle  Ω  Ratio of area on a sphere to its radius squared  steradian (sr)  1  
Specific energy  Energy density per unit mass  J⋅kg^{−1}  L^{2} T^{−2}  intensive  
Specific heat capacity  c  Heat capacity per unit mass  J/(K⋅kg)  L^{2} T^{−2} Θ^{−1}  intensive 
Specific volume  v  Volume per unit mass (reciprocal of density)  m^{3}⋅kg^{−1}  M^{−1} L^{3}  intensive 
Spin  S  Quantummechanically defined angular momentum of a particle  kg⋅m^{2}⋅s^{−1}  M L^{2} T^{−1}  
Strain  ε  Extension per unit length  unitless  1  
Stress  σ  Force per unit oriented surface area  Pa  M L^{−1} T^{−2}  order 2 tensor 
Surface tension  γ  Energy change per unit change in surface area  N/m or J/m^{2}  M T^{−2}  
Temperature gradient  steepest rate of temperature change at a particular location  K/m  Θ L^{−1}  vector  
Thermal conductance  Measure for the ease with which an object conducts heat  W/K  M L^{2} T^{−3} Θ^{−1}  extensive  
Thermal conductivity  λ  Measure for the ease with which a material conducts heat  W/(m⋅K)  M L T^{−3} Θ^{−1}  intensive 
Thermal resistance  R  Measure for the ease with which an object resists conduction of heat  K/W  M^{1} L^{2} T^{3} Θ  extensive 
Thermal resistivity  R_{λ}  Measure for the ease with which a material resists conduction of heat  K⋅m/W  M^{1} L^{1} T^{3} Θ  intensive 
Torque  τ  Product of a force and the perpendicular distance of the force from the point about which it is exerted  newtonmetre (N⋅m)  M L^{2} T^{−2}  bivector (or pseudovector in 3D) 
Velocity  v→  Moved distance per unit time: the first time derivative of position  m/s  L T^{−1}  vector 
Volume  V  Three dimensional extent of an object  m^{3}  L^{3}  extensive, scalar 
Volumetric flow rate  Q  Rate of change of volume with respect to time  m^{3}⋅s^{−1}  L^{3} T^{−1}  extensive, scalar 
Wavelength  λ  Perpendicular distance between repeating units of a wave  m  L  
Wavenumber  k  Repetency or spatial frequency: the number of cycles per unit distance  m^{−1}  L^{−1}  scalar 
Wavevector  k→  Repetency or spatial frequency vector: the number of cycles per unit distance  m^{−1}  L^{−1}  vector 
Weight  w  Gravitational force on an object  newton (N = kg⋅m/s^{2})  M L T^{−2}  vector 
Work  W  Transferred energy  joule (J)  M L^{2} T^{−2}  scalar 
Young's modulus  E  Ratio of stress to strain  pascal (Pa = N/m^{2})  M L^{−1} T^{−2}  scalar; assumes isotropic linear material 