ε, the fifth letter of the Greek alphabet, uppercase ε, lowercase ε, and the Latin alphabet e is changed from ε. It can also refer to a phonetic symbol used in American English, that is, the e sound of bed. It is also the minimum energy value ε (called energy quantum) in the energy quantization hypothesis of German physicist Planck.
Pronunciation of Greek letters and its scientific application
αα，α，/lf？ /,angle, coefficient, angular acceleration.
ββ，β，/'beit？ /,magnetic flux, angle, coefficient.
γγ，γ，/'g？ m？ /,conductivity, angle, specific heat capacity ratio.
δδ，δ，/'delt？ /,variation, diopter, discriminant, partial derivative (some WeChat services).
ζζ，zeta，/'zi:t？ /,coefficient, azimuth, impedance, relative viscosity.
ηη，eta，/'i:t？ /,hysteresis coefficient, efficiency.
θθ，θ，/'θi:t？ /,temperature, angle.
∧λ，lambda，/'l？ md？ /,wavelength, volume, thermal conductivity.
μ μ, mu, /mju:/, permeability coefficient, micro-friction and dynamic friction coefficient, hydrodynamic viscosity.
ν ν, nu, /nju:/, magnetoresistance coefficient, fluid kinematic viscosity, photon frequency, gas coefficient in chemical equation.