List of common physics notations - wikipedia List of common physics notations This is a list of common physical constants and variables, and their notations. Note that bold text indicates that the quantity is a vector. Contents 1 Latin characters 2 Greek characters 3 Other characters 4 See also 5 References Latin characters Symbol Meaning SI unit of measure A ( displaystyle A ) area meter squared ( m ) magnetic vector potential amplitude meter atomic mass number a ( displaystyle mathbf ( a ) ) acceleration meters per second squared ( m / s ) B ( displaystyle mathbf ( B ) ) magnetic flux density also called the magnetic field density or magnetic induction tesla ( T ), or equivalently, weber per square meter ( Wb / m ) C ( displaystyle C ) capacitance farad ( F ) heat capacity joule per kelvin ( J K ), or equivalently, joule per degree Celsius ( J ° C ) constant of integration varied depending on context c ( displaystyle c ) speed of light ( in vacuum ) 299,792,458 meter per second ( m / s ) speed of sound 340.29 meter per second ( m / s ) specific heat capacity joule per kilogram per kelvin ( J kg K ), or equivalently, joule per kilogram per degree Celsius ( J kg ° C ) viscous damping coefficient kilogram per second ( kg / s ) D ( displaystyle mathbf ( D ) ) electric displacement field also called the electric flux density coulomb per square meter ( C / m ) D ( displaystyle D ) density kilograms per cubic meter ( kg / m ) d ( displaystyle d ) distance meter ( m ) direction unitless impact parameter meter ( m ) diameter meter ( m ) differential ( e.g. d x ( displaystyle dx ) ) d A ( displaystyle d mathbf ( A ) ) differential vector element of surface area A, with infinitesimally small magnitude and direction normal to surface S square meter ( m ) d V ( displaystyle dV ) differential element of volume V enclosed by surface S cubic meter ( m ) E ( displaystyle mathbf ( E ) ) electric field newton per coulomb ( N C ), or equivalently, volt per meter ( V m ) E ( displaystyle E ) energy joule ( J ) Young 's Modulus Pascal ( Pa ) or Newton per square meter ( N / m or kilogram per meter per second squared ( kg m s ) e ( displaystyle e ) eccentricity unitless 2.71828... ( base of the natural logarithm ) unitless elementary charge coulomb ( C ) electron 9.10938 × 10 ( kg ) F ( displaystyle mathbf ( F ) ) force newton ( N ) f ( displaystyle f ) frequency hertz ( Hz ) function friction newton ( N ) G ( displaystyle G ) the gravitational constant newton meter squared per kilogram squared ( N m / kg ) g ( displaystyle g ) acceleration due to gravity meter per second squared ( m / s ), or equivalently, newton per kilogramme ( N / kg ) H ( displaystyle mathbf ( H ) ) magnetic field strength ampere per meter ( A / m ) H ( displaystyle H ) Hamiltonian joule ( J ) h ( displaystyle h ) height meter ( m ) Planck 's constant joule second ( J s ) ħ ( displaystyle hbar ) reduced Planck 's constant ( h 2 π ) ( displaystyle \textstyle left ( ( \frac ( h ) ( 2 pi ) ) \right ) ) joule second ( J s ) I ( displaystyle I ) action joule second ( J s ) intensity watt per square meter ( W / m ) sound intensity watt per square meter ( W / m ) electric current ampere ( A ) moment of inertia kilogram meter squared ( kg m ) i ( displaystyle i ) intensity watt per square meter ( W / m ) imaginary unit i ^ ( displaystyle mathbf ( hat ( i ) ) ) Cartesian x-axis basis unit vector unitless j ( displaystyle j ) imaginary unit ( electrical ) J ( displaystyle mathbf ( J ) ) free current density ( not including bound currents due to polarization or magnetization ) ampere per square meter ( A / m ) impulse kilogram meter per second ( kg m / s ) j ^ ( displaystyle mathbf ( hat ( j ) ) ) Cartesian y - axis basis unit vector unitless K ( displaystyle K ) kinetic energy joule ( J ) k ( displaystyle k ) Boltzmann constant joule per kelvin ( J / K ) wavenumber, wave vector radians per meter ( m ) k ^ ( displaystyle mathbf ( hat ( k ) ) ) Cartesian z - axis basis unit vector unitless L ( displaystyle L ) inductance henry ( H ) luminosity watt ( W ) angular momentum newton meter second ( N m s or kg m s ) Lagrangian joule ( J ) l ( displaystyle l ) length meter ( m ) M ( displaystyle M ) magnetization ampere per meter ( A / m ) moment of force often simply called moment or torque newton meter ( N m ) m ( displaystyle m ) mass kilogram ( kg ) N ( displaystyle N ) normal vector unit varies depending on context atomic number unitless n ( displaystyle n ) refractive index unitless principal quantum number unitless P ( displaystyle P ) power watt ( W ) probability unitless p ( displaystyle mathbf ( p ) ) momentum kilogram meter per second ( kg m / s ) pressure pascal ( Pa ) Q ( displaystyle Q ) electric charge coulomb ( C ) Heat joule ( J ) q ( displaystyle q ) electric charge coulomb ( C ) R ( displaystyle R ) electrical resistance ohm ( Ω ) Ricci tensor unitless radiancy gas constant joule per kilogramme kelvin ( J / kgK ) r ( displaystyle mathbf ( r ) ) radius vector ( position ) meter ( m ) r ( displaystyle r ) radius of rotation or distance between two things such as the masses in Newton 's law of universal gravitation meter ( m ) S ( displaystyle S ) surface area m entropy joule per kelvin ( J / K ) action s ( displaystyle s ) arc length meter ( m ) displacement meter ( m ) T ( displaystyle T ) period second ( s ) temperature kelvin ( K ) t ( displaystyle t ) time second ( s ) U ( displaystyle mathbf ( U ) ) four - velocity meter per second ( m / s ) U ( displaystyle U ) potential energy joule ( J ) internal energy joule ( J ) u ( displaystyle u ) relativistic mass kilogram ( kg ) energy density joule per cubic meter ( J / m ) or joule per kilogram ( J / kg ) depending on the context V ( displaystyle V ) voltage also called electric potential difference volt ( V ) volume cubic meter ( m ) shear force v ( displaystyle mathbf ( v ) ) velocity meter per second ( m / s ) W ( displaystyle W ) mechanical work joule ( J ) w ( displaystyle w ) width meter ( m ) x ( displaystyle x ) a generic unknown varied depending on context displacement meter ( m ) Z ( displaystyle Z ) electrical impedance ohm ( Ω ) Greek characters Symbol Name Meaning SI unit of measure α ( displaystyle alpha ) alpha angular acceleration radian per second squared ( rad / s ) β ( displaystyle \beta ) beta velocity in terms of the speed of light c unitless γ ( displaystyle gamma ) gamma Lorentz factor unitless photon gamma ray shear strain Heat capacity ratio unitless Δ ( displaystyle Delta ) delta a change in a variable ( a change of `` blank '' ) ( e.g. Δ x ( displaystyle Delta x ) ) unitless Laplace operator per square meter ( m ) δ ( displaystyle delta ) displacement ( usually small ) ε ( displaystyle epsilon ) epsilon permittivity farad per meter ( F / m ) strain unitless ε 0 ( displaystyle \varepsilon _ ( 0 ) ) epsilon nought The vacuum permittivity constant ζ ( displaystyle zeta ) zeta damping ratio unitless η ( displaystyle eta ) eta energy efficiency unitless coefficient of viscosity also called simply viscosity pascal second ( Pa s ) θ ( displaystyle \theta ) theta angular displacement radian ( rad ) K ( displaystyle mathrm ( K ) ) kappa torsion coefficient also called torsion constant newton meter per radian ( N m / rad ) Λ ( displaystyle Lambda ) lambda cosmological constant per second squared ( s ) λ ( displaystyle lambda ) wavelength meter ( m ) eigenvalue non-zero vector μ ( displaystyle mathbf ( mu ) ) mu magnetic moment ampere square meter ( A m ) coefficient of friction unitless dynamic viscosity Pascal second ( Pa s ) permeability ( electromagnetism ) Henry per meter ( H / m ) reduced mass kilogram ( kg ) gravitational parameter ν ( displaystyle \nu ) nu frequency hertz ( Hz ) kinematic viscosity meters squared per second ( m / s ) π ( displaystyle pi ) pi 3.14159... ( irrational number ) unitless ρ ( displaystyle \rho ) rho mass density usually simply called density kilogram per cubic meter ( kg / m ) free electric charge density, not including dipole charges bound in a material coulomb per cubic meter ( C / m ) resistivity Ohm meter ( Ω ( displaystyle Omega ) m ) Σ ( displaystyle Sigma ) sigma summation operator σ ( displaystyle sigma ) sigma electrical conductivity Siemens per meter ( S / m ) normal stress τ ( displaystyle \tau ) tau torque newton meter ( N m ) shear stress time constant second ( s ) 6.28318... ( 2π ) unitless Φ ( displaystyle Phi ) phi field strength unit varies depending on context Magnetic Flux Weber ( Wb ) φ ( displaystyle phi ) phi Electric Potential volt ( V ) Higgs Field Work Function Ψ ( displaystyle Psi ) psi Wave function m ω ( displaystyle omega ) omega Angular frequency 2πf radian per second ( rad / s ) Ω ( displaystyle Omega ) omega electric resistance ohm η Eta Jerk meter per second cubed ( m / s ) Other characters Symbol Name Meaning SI unit of measure ∇ ⋅ ( displaystyle \nabla cdot ) nabla dot the divergence operator often pronounced `` del dot '' per meter ( m ) ∇ × ( displaystyle \nabla \times ) nabla cross the curl operator often pronounced `` del cross '' per meter ( m ) ∇ ( displaystyle \nabla ) nabla delta ( differential operator ) Δ ( displaystyle Delta ) Delta the Laplace operator per square meter ( m ) ∂ ( displaystyle partial ) `` der '', `` dow '', `` die '', `` partial '' or simply `` d '' partial derivative ( e.g. ∂ y / ∂ x ( displaystyle partial y / partial x ) ) ◻ ( displaystyle Box ) D'Alembert operator ∇ 2 − ∂ t 2 ( displaystyle \nabla ^ ( 2 ) - partial _ ( t ) ^ ( 2 ) ) See also List of letters used in mathematics and science List of mathematical symbols Roman letters used in mathematics Greek letters used in mathematics, science, and engineering Physical constant Physical quantity International System of Units ISO 31 References Retrieved from `` https://en.wikipedia.org/w/index.php?title=List_of_common_physics_notations&oldid=864920079 '' Categories : Physics - related lists Talk Contents About Wikipedia অসমীয়া Русский Українська 中文 Edit links This page was last edited on 20 October 2018, at 12 : 42 ( UTC ). 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Question: what is the symbol for energy in physics
Answer: J