The law is which models are based on Weber’s number is called as Weber’s model law.

Whenever surface tension forces are predominant as compare to other forces for dynamic similarity, Weber number in model must be equal to Weber number in prototype.

W_m = W_p

V_m / √ σ_m / ρ_m L_m = V_p / √ σ_p / ρ_p . L_p

Weber’s model law is applicable in following case:

(i)    Capillary movement of water in soil.
(ii)    Study of droplet, study of very small jet.
(iii)    Capillary waves in channels
(iv)    Flow over weirs for small heads.

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