This article consists of tables outlining a number of physical quantities. A physical quantity is a property of a material or system that can be quantified by measurement; it has a value and units. The International System of Quantities, which underlies the International System of Units, defines seven base quantities; other quantities are generally derived quantities, which can be expressed in terms of the base quantities.

Neither the names nor the symbols used for the physical quantities are set by international standards, although ISO/IEC 80000 does list many of these without making them normative. Some quantities are known by several different names and symbols. The table typically lists the name and symbol that is most commonly used.

The final column lists some properties and characteristics that a quantity has, such as their scaling behaviour (e.g. whether the quantity is intensive or extensive), their transformation properties (i.e. whether the quantity is a scalar, vector, matrix or tensor), and whether the quantity is conserved.

Scalar

+Scalar quantities Name Symbol Description SI unit Quantity dimension Comments absorbed dose rate D Absorbed dose received per unit of time Gy/s L2 T−3 action S Momentum of particle multiplied by distance travelled J/Hz M L2 T−1 amount of substance n The quantity proportional to the number of particles in a sample, with the Avogadro constant as the proportionality constant mole (mol) N ISQ base quantity, extensive angle θ Angular distance radian (rad) 1 angular acceleration ωa Change in angular velocity per unit time rad/s2 T−2 area A, S Extent of a two-dimensional geometric shape m2 L2 extensive, bivector or scalar area density ρA Mass per unit area kg⋅m−2 M L−2 intensive capacitance C Stored charge per unit electric potential farad (F = C/V) M−1 L−2 T4 I2 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 intensive chemical potential μ Energy per unit change in amount of substance J/mol M L2 T−2 N−1 intensive density (or volume density) ρ Mass per unit volume kg/m3 M L−3 intensive dose equivalent H Received radiation adjusted for the effect on biological tissue sievert (Sv = J/kg) L2 T−2 intensive electric charge Q The force per unit electric field strength coulomb (C = A⋅s) T I extensive, conserved electric charge density ρQ Electric charge per unit volume C/m3 L−3 T I intensive electrical conductance G Measure for how easily current flows through a material siemens (S = Ω−1) M−1 L−2 T3 I2 electrical conductivity σ Measure of a material's ability to conduct an electric current S/m M−1 L−3 T3 I2 electric current I Rate of flow of electrical charge per unit time ampere (A) I ISQ base quantity, extensive electric potential φ Energy required to move a unit charge through an electric field from a reference point volt (V = J/C) M L2 T−3 I−1 extensive electrical resistance R Electric potential per unit electric current ohm (Ω = V/A) M L2 T−3 I−2 extensive, assumes linearity electrical resistivity ρe Bulk property equivalent of electrical resistance ohm-metre (Ω⋅m) M L3 T−3 I−2 extensive, conserved energy E Energy joule (J) M L2 T−2 energy density U Energy per 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 L2 T−2 Θ−1 extensive frequency f Number of (periodic) occurrences per unit time hertz (Hz = s−1) T−1 half-life t1/2 Time for a quantity to decay to half its initial value s T heat Q Heat joule (J) M L2 T−2 heat capacity Cp Energy per unit temperature change J/K M L2 T−2 Θ−1 extensive heat flux density ϕQ Heat flow per unit time per unit surface area W/m2 M T−3 illuminance Ev Wavelength-weighted luminous flux per unit surface area lux (lx = cd⋅sr/m2) L−2 J intensive impedance Z Resistance to an alternating current of a given frequency, including effect on phase ohm (Ω) M L2 T−3 I−2 complex scalar inductance L Magnetic flux generated per unit current through a circuit henry (H) M L2 T−2 I−2 irradiance E Electromagnetic radiation power per unit surface area W/m2 M T−3 intensive intensity I Power per unit cross sectional area W/m2 M T−3 intensive kinetic energy KE The work or force in the direction of motion times displacement joule (J) M L2 T−2 extensive length l, L linear extent between two points, which may be along some path metre (m) L ISQ base quantity, extensive linear density ρl Mass per unit length kg⋅m−1 M L−1 luminous intensity Iv Wavelength-weighted power of emitted light per unit solid angle candela (cd) J ISQ base quantity luminous flux (or luminous power) F Perceived power of a light source lumen (lm = cd⋅sr) J extensive Mach number (or mach) M Ratio of flow velocity to the local speed of sound 1 1 intensive magnetic flux Φ Measure of magnetism, taking account of the strength and the extent of a magnetic field weber (Wb) M L2 T−2 I−1 mass m A measure of resistance to acceleration kilogram (kg) M ISQ base quantity, extensive mass fraction x Mass of a substance as a fraction of the total mass 1 1 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 L2 T−2 N−1 intensive molar entropy S° Entropy per unit amount of substance J/(K⋅mol) M L2 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 L2 T−2 Θ−1 N−1 intensive moment of inertia I Inertia of an object with respect to angular acceleration kg⋅m2 M L2 extensive, tensor, scalar optical power P Measure of the effective curvature of a lens or curved mirror; inverse of focal length dioptre (dpt = m−1) L−1 intensive permeability μs 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 εs Measure for how the polarization of a material is affected by the application of an external electric field F/m M−1 L−3 T4 I2 intensive plane angle θ Ratio of circular arc length to radius radian (rad) 1 intensive potential energy PE The energy of an object or system due to the body's position relative to other objects, or the configuration of its particles joule (J) M L2 T−2 power P Rate of transfer of energy per unit time watt (W) M L2 T−3 extensive pressure p Force per unit area pascal (Pa = N/m2) M L−1 T−2 intensive (radioactivity) activity A Number of particles decaying per unit time becquerel (Bq = Hz) T−1 extensive (radiation) dose D Ionizing radiation energy absorbed per unit mass gray (Gy = J/kg) L2 T−2 radiance L Power of emitted electromagnetic radiation per unit solid angle per emitting source area W/(m2⋅sr) M T−3 radiant intensity I Power of emitted electromagnetic radiation per unit solid angle W/sr M L2 T−3 reaction rate r Rate of a chemical reaction for unit time mol/(m3⋅s) L−3 T−1 N intensive refractive index n Factor by which the phase velocity of light is reduced in a medium 1 1 intensive reluctance

Resistance to the flow of magnetic flux H−1 M−1 L−2 T2 I2 solid angle Ω Ratio of area on a sphere to its radius squared steradian (sr) 1 intensive specific energy e Energy density per unit mass J⋅kg−1 L2 T−2 intensive specific heat capacity c Heat capacity per unit mass J/(K⋅kg) L2 T−2 Θ−1 intensive specific volume v Volume per unit mass (reciprocal of density) m3⋅kg−1 M−1 L3 intensive speed v magnitude of velocity m/s L T−1 intensive spin S Quantum-mechanically defined angular momentum of a particle kg⋅m2⋅s−1 M L2 T−1 strain ε Extension per unit length 1 1 intensive 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/m2 M T−2 temperature T Average kinetic energy per degree of freedom of a system kelvin (K) Θ ISQ base quantity, intensive time t The duration of an event second (s) T ISQ base quantity, extensive thermal conductance κ, λ Measure for the ease with which an object conducts heat W/K M L2 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 T3 Θ extensive Thermal resistivity Rλ Measure for the ease with which a material resists conduction of heat K⋅m/W M−1 L−1 T3 Θ intensive viscosity η The measure of the internal friction in a fluid Pa⋅s M L−1 T−1 intensive volume V Three dimensional extent of an object m3 L3 extensive volumetric flow rate Q Rate of change of volume with respect to time m3⋅s−1 L3 T−1 extensive wavelength λ length of the repetition interval of a wave as measured in the direction of propagation m L wavenumber k Repetency or spatial frequency: the inverse of the wavelength m−1 L−1 intensive work W Transferred energy joule (J) M L2 T−2 Young's modulus E Ratio of stress to strain pascal (Pa) M L−1 T−2 scalar; assumes isotropic linear material spring constant k k is the torsional constant (measured in N·m/rad), which characterizes the stiffness of the torsional spring or the resistance to angular displacement. N/m M T−2

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