greek-alphabets-physics

Greek Alphabets Used in Physics

The following is the table showing the “most commonly used” Greek Alphabets and their typical meaning in Physics. Also lists the Physical Constants which they typically represent.

Greek Letter Upper Case Lower Case Commonly Represents in Physics
Alpha A \alpha Angular acceleration
Linear Expansion
Coefficient
Alpha particle (helium nucleus)
Fine Structure Constant
Beta B \beta Beta particle (high energy electron)
Sound intensity
Gamma \Gamma \gamma Gamma ray (high energy EM wave)
Ratio of heat capacities (in an ideal gas)
Relativistic correction factor
Delta \Delta \delta \Delta – Change
\delta – Infinitesimal change
Epsilon E \epsilon ~/~ \varepsilon Emissivity
Strain
Permittivity
EMF
Zeta Z \zeta Damping ratio
Coefficient of viscous friction in polymers
Relative Vertical Vorticity in Fluid Dynamics
Eta H \eta Viscosity
Energy efficiency
Theta \Theta \theta ~/~ \vartheta Angle
Temperature
Iota I \iota Identity Matrix
Moment of Inertia
Kappa K \kappa Spring constant
Dielectric constant
Lambda \Lambda \lambda Wavelength
Thermal conductivity
Constant
Linear Density
Mu M \mu Coefficient of friction
Electrical mobility
Reduced mass
Permeability
Nu N \nu Frequency
Xi \Xi \xi Damping coefficient
Omicron O o {not commonly used}
Pi \Pi \pi \pi~=~3.14159 \cdots
Rho P \rho ~/~ \varrho Volume density
Resistivity
Sigma \Sigma \sigma Boltzmann constant
Electrical conductivity
Uncertainty
Stress
Surface density
Tau T \tau Torque
Tau particle (a lepton)
Time constant
Upsilon \Upsilon \upsilon mass to light ratio
Phi \Phi \phi ~/~ \varphi Magnetic / electric flux
Angle
Chi X \chi Susceptibility
Psi \Psi \psi Wave function
Omega \Omega \omega Ohms (unit of electric resistance)
\omega – Angular velocity
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