Definition of Weber number in English:

Weber number

Pronunciation /ˈveɪbə ˌnʌmbə/


(also Weber's number)
  • The ratio between the inertial forces acting upon a fluid flowing through a fluid medium and its surface tension, frequently used in the study of the formation of bubbles and droplets; (occasionally also) the square root of this ratio.

    The Weber number is frequently expressed as ρlv 2/γ, where γ is the surface tension of the fluid, ρ its density, l the characteristic length, and v the velocity of the fluid.


1930s. In some forms from the genitive of the name of Moritz Weber, German naval engineer, who first defined the ratio in 1919 + number, after German webersche Zahl.