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Young-Laplace equation

1. n. [Enhanced Oil Recovery]

A relationship describing the pressure difference across an interface between two fluids at a static, curved interface. This relationship defines the capillary pressure difference at such an interface.

(1.) Pc = σ (1/R1 + 1/R2),

(2.) Pc = 2σ/r,

where
Pc = capillary pressure
σ = interfacial tension between the fluids
R1, R2 = principal radii of curvature of the interface
r = capillary radius.

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