List of physical quantities - wikipedia 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 B - field 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 ) or whether the quantity is conserved. Base quantity Symbol Description SI base unit Dimension Comments Length l The one - dimensional extent of an object metre ( m ) Mass m A measure of resistance to acceleration kilogram ( kg ) extensive, scalar Time The duration of an event second ( s ) scalar Electric current Rate of flow of electrical charge per unit time ampere ( A ) Temperature Average kinetic energy per degree of freedom of a system kelvin ( K ) Θ intensive, scalar Amount of substance mol Number of particles compared to the number of atoms in 0.012 kg of C mole ( mol ) extensive, scalar Luminous intensity Wavelength - weighted power of emitted light per unit solid angle candela ( cd ) J scalar This list is incomplete ; you can help by expanding it. Derived quantity Symbol Description SI derived unit Dimension Comments Absement Measure of sustained displacement : the first integral of displacement ms vector Absorbed dose rate Absorbed dose received per unit of time Gy s Acceleration a → Change of the speed or velocity per unit time ms vector Angular acceleration α Change in angular speed or velocity per unit time rad s Angular momentum Measure of the extent and direction an object rotates about a reference point kg m s conserved quantity, pseudovector Angular speed ( or angular velocity ) ω The angle incremented in a plane by a segment connecting an object and a reference point per unit time rad s scalar or pseudovector Area Extent of a surface m scalar Area density ρ Mass per unit area kg m Capacitance Stored charge per unit electric potential farad ( F = A s kg m ) scalar Catalytic activity Change in reaction rate due to presence of a catalyst katal ( kat = mol s ) Catalytic activity concentration Change in reaction rate due to presence of a catalyst per unit volume of the system kat m Chemical potential μ Energy per unit change in amount of substance J mol intensive Crackle c → Change of jounce per unit time : the fifth time derivative of position ms vector Current density J → Electric current per unit cross-section area A m vector Dose equivalent Received radiation adjusted for the effect on biological tissue sievert ( Sv = m s ) Dynamic viscosity η Measure for the resistance of an incompressible fluid to stress Pa s Electric charge Q The force per unit electric field strength coulomb ( C = A s ) extensive, conserved quantity Electric charge density ρ Electric charge per unit volume C m intensive Electric displacement Strength of the electric displacement C m vector field Electric field strength E → Strength of the electric field V m vector field Electrical conductance Measure for how easily current flows through a material siemens ( S = A s kg m ) scalar Electrical conductivity σ Measure of a material 's ability to conduct an electric current S m scalar Electric potential V Energy required to move a unit charge through an electric field from a reference point volt ( V = kg m A s ) extensive, scalar Electrical resistance Electric potential per unit electric current ohm ( Ω = kg m A s ) extensive, scalar, assumes linearity Electrical resistivity ρ Bulk property equivalent of electrical resistance ohm metre ( Ω ⋅ m = kg m A s ) intensive, scalar Energy Capacity of a body or system to do work joule ( J = kg m s ) extensive, scalar, conserved quantity Energy density ρ Energy per unit volume J m intensive Entropy Logarithmic measure of the number of available states of a system JK M L T Θ extensive, scalar Force F → Transfer of momentum per unit time newton ( N = kg ms ) extensive, vector Frequency f Number of ( periodic ) occurrences per unit time hertz ( Hz = s ) scalar Fuel efficiency Distance traveled per unit volume of fuel scalar Half - life Time for a quantity to decay to half its initial value s Heat Q Thermal energy joule ( J ) Heat capacity Energy per unit temperature change JK M L T Θ extensive Heat flux density φ Heat flow per unit time per unit surface area W m Illuminance Luminous flux per unit surface area lux ( lx = cd sr m ) L J Impedance Z Resistance to an alternating current of a given frequency, including effect on phase ohm ( Ω = kg m A s ) complex scalar Impulse p → Transferred momentum newton second ( N ⋅ s = kg ms ) vector Inductance Magnetic flux generated per unit current through a circuit henry ( H = kg m A s ) scalar Irradiance Electromagnetic radiation power per unit surface area W m Intensity Power per unit cross sectional area W m Jerk j → Change of acceleration per unit time : the third time derivative of position ms vector Jounce ( or snap ) s → Change of jerk per unit time : the fourth time derivative of position ms vector Linear density ρ Mass per unit length Luminous flux ( or luminous power ) Perceived power of a light source lumen ( lm = cd sr ) J Mach number ( or mach ) Ratio of flow velocity to the local speed of sound unitless Magnetic field strength Strength of a magnetic field A m vector field Magnetic flux Φ Measure of magnetism, taking account of the strength and the extent of a magnetic field weber ( Wb = kg m A s ) scalar Magnetic flux density Measure for the strength of the magnetic field tesla ( T = kg A s ) pseudovector field Magnetization Amount of magnetic moment per unit volume A m vector field Mass fraction x Mass of a substance as a fraction of the total mass kg / kg intensive ( Mass ) Density ( or volume density ) ρ Mass per unit volume kg m intensive Mean lifetime τ Average time for a particle of a substance to decay s intensive Molar concentration Amount of substance per unit volume mol m intensive Molar energy Amount of energy present in a system per unit amount of substance J mol intensive Molar entropy Entropy per unit amount of substance JK mol M L T Θ N intensive Molar heat capacity Heat capacity of a material per unit amount of substance JK mol intensive Moment of inertia Inertia of an object with respect to angular acceleration kg m tensor, scalar Momentum p → Product of an object 's mass and velocity N s vector, extensive Permeability μ Measure for how the magnetization of material is affected by the application of an external magnetic field H m intensive Permittivity ε Measure for how the polarization of a material is affected by the application of an external electric field F m intensive Plane angle θ Ratio of circular arc length to radius radian ( rad ) Power Rate of transfer of energy per unit time watt ( W ) extensive, scalar Pressure p Force per unit area pascal ( Pa = kg m s ) intensive, scalar Pop p → Rate of change of crackle per unit time : the sixth time derivative of position ms vector ( Radioactive ) Activity Number of particles decaying per unit time becquerel ( Bq = s ) extensive, scalar ( Radioactive ) Dose Ionizing radiation energy absorbed by biological tissue per unit mass gray ( Gy = m s ) Radiance Power of emitted electromagnetic radiation per unit solid angle per emitting source area W m sr Radiant intensity Power of emitted electromagnetic radiation per unit solid angle W sr scalar Reaction rate r Rate of a chemical reaction for unit time mol m s intensive, scalar Refractive index n Factor by which the phase velocity of light is reduced in a medium unitless intensive, scalar Solid angle Ω Ratio of area on a sphere to its radius squared steradian ( sr ) Speed Moved distance per unit time : the first time derivative of position ms scalar Specific energy Energy density per unit mass J kg intensive Specific heat capacity Heat capacity per unit mass J kg K L T Θ intensive Specific volume Volume per unit mass ( reciprocal of density ) m kg intensive Spin Quantum - mechanically defined angular momentum of a particle kg m s Strain ε Extension per unit length unitless Stress σ Force per unit oriented surface area Pa order 2 tensor Surface tension γ Energy change per unit change in surface area N m or J m Thermal conductivity k Measure for the ease with which a material conducts heat W m K M L T Θ intensive Torque τ Product of a force and the perpendicular distance of the force from the point about which it is exerted newton metre ( N m ) bivector ( or pseudovector in 3D ) Velocity v → Speed and direction of an object ms vector Volume V Three dimensional extent of an object m extensive, scalar Wavelength λ Perpendicular distance between repeating units of a wave m Wavenumber k Repetency or spacial frequency : the number of cycles per unit distance m scalar Wavevector k → Repetency or spacial frequency vector : the number of cycles per unit distance m with direction vector Weight w Gravitational force on an object newton ( N = kg ms ) vector Work Transferred energy joule ( J = kg m s ) scalar Young 's modulus Ratio of stress to strain pascal ( Pa = kg m s ) scalar ; assumes isotropic linear material Retrieved from `` https://en.wikipedia.org/w/index.php?title=List_of_physical_quantities&oldid=800291815 '' Categories : Physics - related lists Physical quantities Hidden categories : Incomplete lists from May 2014 Talk About Wikipedia Български Deutsch Eesti हिन्दी Latina Magyar Bahasa Melayu Русский Svenska தமிழ் Edit links This page was last edited on 12 September 2017, at 16 : 29. 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Question: basic s i units of any five physical quantities
Answer: metre