Laplace's law or Laplace's rule may refer to several concepts:
Biot–Savart law, in electromagnetics, describing magnetic field set up by a steady current density Young–Laplace equation, in physics, describing pressure difference over an interface in fluid mechanics Laplace expansion, in linear algebra, an expression of the determinant of a matrix Rule of succession, in probability theory, a smoothing technique accounting for unseen data
See also List of things named after Pierre-Simon Laplace