<P> This is a list of common physical constants and variables, and their notations . Note that bold text indicates that the quantity is a vector . </P> <Table> <Tr> <Th> Symbol </Th> <Th> Meaning </Th> <Th> SI unit of measure </Th> </Tr> <Tr> <Td> A (\ displaystyle A) </Td> <Td> area </Td> <Td> meter squared (m) </Td> </Tr> <Tr> <Td> magnetic vector potential </Td> <Td> </Td> </Tr> <Tr> <Td> amplitude </Td> <Td> meter </Td> </Tr> <Tr> <Td> atomic mass number </Td> <Td> </Td> </Tr> <Tr> <Td> a (\ displaystyle \ mathbf (a)) </Td> <Td> acceleration </Td> <Td> meters per second squared (m / s) </Td> </Tr> <Tr> <Td> B (\ displaystyle \ mathbf (B)) </Td> <Td> magnetic flux density also called the magnetic field density or magnetic induction </Td> <Td> tesla (T), or equivalently, weber per square meter (Wb / m) </Td> </Tr> <Tr> <Td> C (\ displaystyle C) </Td> <Td> capacitance </Td> <Td> farad (F) </Td> </Tr> <Tr> <Td> heat capacity </Td> <Td> joule per kelvin (J K), or equivalently, joule per degree Celsius (J ° C) </Td> </Tr> <Tr> <Td> constant of integration </Td> <Td> varied depending on context </Td> </Tr> <Tr> <Td> c (\ displaystyle c) </Td> <Td> speed of light (in vacuum) </Td> <Td> 299,792,458 meter per second (m / s) </Td> </Tr> <Tr> <Td> speed of sound </Td> <Td> 340.29 meter per second (m / s) </Td> </Tr> <Tr> <Td> specific heat capacity </Td> <Td> joule per kilogram per kelvin (J kg K), or equivalently, joule per kilogram per degree Celsius (J kg ° C) </Td> </Tr> <Tr> <Td> viscous damping coefficient </Td> <Td> kilogram per second (kg / s) </Td> </Tr> <Tr> <Td> D (\ displaystyle \ mathbf (D)) </Td> <Td> electric displacement field also called the electric flux density </Td> <Td> coulomb per square meter (C / m) </Td> </Tr> <Tr> <Td> D (\ displaystyle D) </Td> <Td> density </Td> <Td> kilograms per cubic meter (kg / m) </Td> </Tr> <Tr> <Td> d (\ displaystyle d) </Td> <Td> distance </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> direction </Td> <Td> unitless </Td> </Tr> <Tr> <Td> impact parameter </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> diameter </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> differential (e.g. d x (\ displaystyle dx)) </Td> <Td> </Td> </Tr> <Tr> <Td> d A (\ displaystyle d \ mathbf (A)) </Td> <Td> differential vector element of surface area A, with infinitesimally <P> small magnitude and direction normal to surface S </P> </Td> <Td> square meter (m) </Td> </Tr> <Tr> <Td> d V (\ displaystyle dV) </Td> <Td> differential element of volume V enclosed by surface S </Td> <Td> cubic meter (m) </Td> </Tr> <Tr> <Td> E (\ displaystyle \ mathbf (E)) </Td> <Td> electric field </Td> <Td> newton per coulomb (N C), or equivalently, volt per meter (V m) </Td> </Tr> <Tr> <Td> E (\ displaystyle E) </Td> <Td> energy </Td> <Td> joule (J) </Td> </Tr> <Tr> <Td> Young's Modulus </Td> <Td> Pascal (Pa) or Newton per square meter (N / m or kilogram per meter per second squared (kg m s) </Td> </Tr> <Tr> <Td> e (\ displaystyle e) </Td> <Td> eccentricity </Td> <Td> unitless </Td> </Tr> <Tr> <Td> 2.71828...(base of the natural logarithm) </Td> <Td> unitless </Td> </Tr> <Tr> <Td> elementary charge </Td> <Td> coulomb (C) </Td> </Tr> <Tr> <Td> electron </Td> <Td> 9.10938 × 10 (kg) </Td> </Tr> <Tr> <Td> F (\ displaystyle \ mathbf (F)) </Td> <Td> force </Td> <Td> newton (N) </Td> </Tr> <Tr> <Td> f (\ displaystyle f) </Td> <Td> frequency </Td> <Td> hertz (Hz) </Td> </Tr> <Tr> <Td> function </Td> <Td> </Td> </Tr> <Tr> <Td> friction </Td> <Td> newton (N) </Td> </Tr> <Tr> <Td> G (\ displaystyle G) </Td> <Td> the gravitational constant </Td> <Td> newton meter squared per kilogram squared (N m / kg) </Td> </Tr> <Tr> <Td> g (\ displaystyle g) </Td> <Td> acceleration due to gravity </Td> <Td> meter per second squared (m / s), or equivalently, newton per kilogramme (N / kg) </Td> </Tr> <Tr> <Td> H (\ displaystyle \ mathbf (H)) </Td> <Td> magnetic field strength </Td> <Td> ampere per meter (A / m) </Td> </Tr> <Tr> <Td> H (\ displaystyle H) </Td> <Td> Hamiltonian </Td> <Td> joule (J) </Td> </Tr> <Tr> <Td> h (\ displaystyle h) </Td> <Td> height </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> Planck's constant </Td> <Td> joule second (J s) </Td> </Tr> <Tr> <Td> ħ (\ displaystyle \ hbar) </Td> <Td> reduced Planck's constant (h 2 π) (\ displaystyle \ textstyle \ left ((\ frac (h) (2 \ pi)) \ right)) </Td> <Td> joule second (J s) </Td> </Tr> <Tr> <Td> I (\ displaystyle I) </Td> <Td> action </Td> <Td> joule second (J s) </Td> </Tr> <Tr> <Td> intensity </Td> <Td> watt per square meter (W / m) </Td> </Tr> <Tr> <Td> sound intensity </Td> <Td> watt per square meter (W / m) </Td> </Tr> <Tr> <Td> electric current </Td> <Td> ampere (A) </Td> </Tr> <Tr> <Td> moment of inertia </Td> <Td> kilogram meter squared (kg m) </Td> </Tr> <Tr> <Td> i (\ displaystyle i) </Td> <Td> intensity </Td> <Td> watt per square meter (W / m) </Td> </Tr> <Tr> <Td> imaginary unit </Td> <Td> </Td> </Tr> <Tr> <Td> i ^ (\ displaystyle \ mathbf (\ hat (i))) </Td> <Td> Cartesian x-axis basis unit vector </Td> <Td> unitless </Td> </Tr> <Tr> <Td> j (\ displaystyle j) </Td> <Td> imaginary unit (electrical) </Td> <Td> </Td> </Tr> <Tr> <Td> J (\ displaystyle \ mathbf (J)) </Td> <Td> free current density (not including bound currents due to polarization or magnetization) </Td> <Td> ampere per square meter (A / m) </Td> </Tr> <Tr> <Td> impulse </Td> <Td> kilogram meter per second (kg m / s) </Td> </Tr> <Tr> <Td> j ^ (\ displaystyle \ mathbf (\ hat (j))) </Td> <Td> Cartesian y - axis basis unit vector </Td> <Td> unitless </Td> </Tr> <Tr> <Td> K (\ displaystyle K) </Td> <Td> kinetic energy </Td> <Td> joule (J) </Td> </Tr> <Tr> <Td> k (\ displaystyle k) </Td> <Td> Boltzmann constant </Td> <Td> joule per kelvin (J / K) </Td> </Tr> <Tr> <Td> wavenumber, wave vector </Td> <Td> radians per meter (m) </Td> </Tr> <Tr> <Td> k ^ (\ displaystyle \ mathbf (\ hat (k))) </Td> <Td> Cartesian z - axis basis unit vector </Td> <Td> unitless </Td> </Tr> <Tr> <Td> L (\ displaystyle L) </Td> <Td> inductance </Td> <Td> henry (H) </Td> </Tr> <Tr> <Td> luminosity </Td> <Td> watt (W) </Td> </Tr> <Tr> <Td> angular momentum </Td> <Td> newton meter second (N m s or kg m s) </Td> </Tr> <Tr> <Td> Lagrangian </Td> <Td> joule (J) </Td> </Tr> <Tr> <Td> l (\ displaystyle l) </Td> <Td> length </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> M (\ displaystyle M) </Td> <Td> magnetization </Td> <Td> ampere per meter (A / m) </Td> </Tr> <Tr> <Td> moment of force often simply called moment or torque </Td> <Td> newton meter (N m) </Td> </Tr> <Tr> <Td> m (\ displaystyle m) </Td> <Td> mass </Td> <Td> kilogram (kg) </Td> </Tr> <Tr> <Td> N (\ displaystyle N) </Td> <Td> normal vector </Td> <Td> unit varies depending on context </Td> </Tr> <Tr> <Td> atomic number </Td> <Td> unitless </Td> </Tr> <Tr> <Td> n (\ displaystyle n) </Td> <Td> refractive index </Td> <Td> unitless </Td> </Tr> <Tr> <Td> principal quantum number </Td> <Td> unitless </Td> </Tr> <Tr> <Td> P (\ displaystyle P) </Td> <Td> power </Td> <Td> watt (W) </Td> </Tr> <Tr> <Td> probability </Td> <Td> unitless </Td> </Tr> <Tr> <Td> p (\ displaystyle \ mathbf (p)) </Td> <Td> momentum </Td> <Td> kilogram meter per second (kg m / s) </Td> </Tr> <Tr> <Td> pressure </Td> <Td> pascal (Pa) </Td> </Tr> <Tr> <Td> Q (\ displaystyle Q) </Td> <Td> electric charge </Td> <Td> coulomb (C) </Td> </Tr> <Tr> <Td> Heat </Td> <Td> joule (J) </Td> </Tr> <Tr> <Td> q (\ displaystyle q) </Td> <Td> electric charge </Td> <Td> coulomb (C) </Td> </Tr> <Tr> <Td> R (\ displaystyle R) </Td> <Td> electrical resistance </Td> <Td> ohm (Ω) </Td> </Tr> <Tr> <Td> Ricci tensor </Td> <Td> unitless </Td> </Tr> <Tr> <Td> radiancy </Td> <Td> </Td> </Tr> <Tr> <Td> gas constant </Td> <Td> joule per kilogramme kelvin (J / kgK) </Td> </Tr> <Tr> <Td> r (\ displaystyle \ mathbf (r)) </Td> <Td> radius vector (position) </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> r (\ displaystyle r) </Td> <Td> radius of rotation or distance between two things such as the masses in Newton's law of universal gravitation </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> S (\ displaystyle S) </Td> <Td> surface area </Td> <Td> m </Td> </Tr> <Tr> <Td> entropy </Td> <Td> joule per kelvin (J / K) </Td> </Tr> <Tr> <Td> action </Td> <Td> </Td> </Tr> <Tr> <Td> s (\ displaystyle s) </Td> <Td> arc length </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> displacement </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> T (\ displaystyle T) </Td> <Td> period </Td> <Td> second (s) </Td> </Tr> <Tr> <Td> temperature </Td> <Td> kelvin (K) </Td> </Tr> <Tr> <Td> t (\ displaystyle t) </Td> <Td> time </Td> <Td> second (s) </Td> </Tr> <Tr> <Td> U (\ displaystyle \ mathbf (U)) </Td> <Td> four - velocity </Td> <Td> meter per second (m / s) </Td> </Tr> <Tr> <Td> U (\ displaystyle U) </Td> <Td> potential energy </Td> <Td> joule (J) </Td> </Tr> <Tr> <Td> internal energy </Td> <Td> joule (J) </Td> </Tr> <Tr> <Td> u (\ displaystyle u) </Td> <Td> relativistic mass </Td> <Td> kilogram (kg) </Td> </Tr> <Tr> <Td> energy density </Td> <Td> joule per cubic meter (J / m) or joule per kilogram (J / kg) depending on the context </Td> </Tr> <Tr> <Td> V (\ displaystyle V) </Td> <Td> voltage also called electric potential difference </Td> <Td> volt (V) </Td> </Tr> <Tr> <Td> volume </Td> <Td> cubic meter (m) </Td> </Tr> <Tr> <Td> shear force </Td> <Td> </Td> </Tr> <Tr> <Td> v (\ displaystyle \ mathbf (v)) </Td> <Td> velocity </Td> <Td> meter per second (m / s) </Td> </Tr> <Tr> <Td> W (\ displaystyle W) </Td> <Td> mechanical work </Td> <Td> joule (J) </Td> </Tr> <Tr> <Td> w (\ displaystyle w) </Td> <Td> width </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> x (\ displaystyle x) </Td> <Td> a generic unknown </Td> <Td> varied depending on context </Td> </Tr> <Tr> <Td> displacement </Td> <Td> meter (m) </Td> </Tr> <Tr> <Td> Z (\ displaystyle Z) </Td> <Td> electrical impedance </Td> <Td> ohm (Ω) </Td> </Tr> </Table> <Tr> <Th> Symbol </Th> <Th> Meaning </Th> <Th> SI unit of measure </Th> </Tr>

What is the symbol for energy in physics