Interfacial Physics
Physical relations between interfacial tension, curvature and pressure differences across liquid interfaces.
From interface curvature to measurable pressure.
Curved liquid interfaces generate pressure differences between adjoining phases. The magnitude of this pressure difference depends on the interfacial tension and the geometry of the interface.
The Young–Laplace equation provides the central physical relation linking these quantities and forms the basis of many capillary and drop-shape measurement techniques used in surface and interfacial characterization.
Explore the physics of curved interfaces.
Scientific topics covering curvature, capillary pressure and the mechanical relations governing drops and bubbles.
Young–Laplace Equation
The Young–Laplace equation relates the pressure difference across a curved interface to interfacial tension and the principal radii of curvature.
Capillary Pressure
A curved interface sustains a pressure difference between its two sides that is balanced mechanically by interfacial tension acting through curvature.
Curvature of Liquid Interfaces
The curvature of an interface is described by its principal radii and determines, together with interfacial tension, the corresponding capillary pressure.
Gravity and Density Difference in Drop Shape Analysis
The shape of a millimetric drop reflects competition between interfacial tension and gravity, while the density difference between the phases determines the gravitational deformation available for profile analysis.