Laplace’s equation is applied in soil physics to explain:

Correct option is B

· Laplace equation governs capillary rise and curvature of water meniscus.
· Parent law:

Where T = surface tension; r = radius of curvature.
· Used in deriving capillary rise, matric potential, suction.
Why other options are wrong
· (a) Aeration does not involve Laplace.
· (c) Osmotic pressure = Van’t Hoff relation.
· (d) Chemical potential governed by thermodynamics, not Laplace.