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Symbol | Meaning |
---|---|

A | area |

a | acceleration |

B | magnetic field |

C | capacitance, heat capacity |

c | speed of light (in a vacuum), speed of sound, specific heat capacity |

D | electric displacement |

d | distance, diameter, differential (e.g. dx) |

E | energy, electric field |

F | force |

f | friction, frequency, function |

G | gravitational constant |

g | acceleration due to gravity |

H | magnetic field |

h | height, Planck constant |

reduced Planck constant | |

I | electric current, sound intensity, moment of inertia |

i | imaginary unit |

J | current density |

k | Boltzmann constant, thermal conductivity |

L | angular momentum, inductance |

l | length |

M | moment of force |

m | mass |

n | refractive index |

P | power, pressure |

p | momentum |

Q | electric charge, heat |

R | electrical resistance |

r | radius, radius vector (position) |

S | surface area, entropy, action |

s | displacement |

T | temperature, period |

t | time |

U | internal energy, potential energy |

V | volume, voltage, shear force |

v | velocity |

W | mechanical work |

w | width |

x | a generic unknown, displacement |

γ | (Gamma) Lorentz factor, photon, gamma ray |

Δ | (Delta) a change in a variable (e.g. Δx) |

δ | (Delta) displacement (usually small) |

ε | (Epsilon) strain |

ζ | (Zeta) damping ratio |

η | (Eta) energy efficiency |

θ | (Theta) angle |

λ | (Lambda) wavelength |

μ | (Mu) coefficient of friction, dynamic viscosity, permeability (electromagnetism) |

ν | (Nu) kinematic viscosity |

π | (Pi) 3.14159... |

ρ | (Rho) resistivity, density, charge density |

Σ | (Sigma) summation operator |

σ | (Sigma) electrical conductivity, normal stress |

τ | (Tau) torque, shear stress, time constant |

Φ | (Phi) magnetic flux |

φ | (Phi) electric potential |

Ω | (Omega) ohm |

ω | (Omega) angular frequency |