The square root of the ratio of the inertia force to the surface tension force. It s denoted by W_e.

W_e =  √ Inertia force / Surface tension force

= √ Mass x Acceleration / Surface tension x Length

= √ ρ . V x V / T            V / T = Q = V . A

=  √ ρ . V . V. A / σ.L      A  =  L²

=  √ ρ L² V² / σ . L

W_e  = V / ρL

Capillary movement of water in soils, flow of blood in veins and arteries where the surface tension effects are predominant.

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