Equations of physics
 2.3.3 Poisson's Equation and Laplace's Equation - YouTube Sep 8, 2012 ... Taking the divergence of the gradient of the potential gives us two interesting equations. Playlist: ...
 Relativistic wave equations - Slideshow
 Dirac equation In particle physics, the Dirac equation is a relativistic wave equation derived by British physicist Paul Dirac in 1928. In its free form, or including electromagnetic interactions, it describes all s...
 Equations of fluid dynamics
 Maxwell's equations Maxwell's equations are a set of partial differential equations that, together with the Lorentz force law, form the foundation of classical electrodynamics, classical optics, and electric circuits. Th... Maxwell's equations - Wikipedia
 Schrödinger equation In quantum mechanics, the Schrödinger equation is a partial differential equation that describes how the quantum state of a physical system changes with time. It was formulated in late 1925, and publi... Schrödinger equation - Wikipedia
 Equation of state In physics and thermodynamics, an equation of state is a relation between state variables. More specifically, an equation of state is a thermodynamic equation describing the state of matter under a g...
 Washburn's equation In physics, Washburn's equation describes capillary flow in a bundle of parallel cylindrical tubes; it is extended with some issues also to imbibition into porous materials. The equation is named afte...
 Bethe–Salpeter equation The Bethe–Salpeter equation, named after Hans Bethe and Edwin Salpeter, describes the bound states of a two-body (particles) quantum field theoretical system in a relativistically covariant formalism....
 Boltzmann equation In physics, specifically non-equilibrium statistical mechanics, the Boltzmann equation or Boltzmann transport equation (BTE) describes the statistical behaviour of a thermodynamic system not in thermo...
 Breit equation The Breit equation is a relativistic wave equation derived by Gregory Breit in 1929 based on the Dirac equation, which formally describes two or more massive spin-1/2 particles (electrons, for example...
 Constitutive equation In physics and engineering, a constitutive equation or constitutive relation is a relation between two physical quantities (especially kinetic quantities as related to kinematic quantities) that is sp...
 Lorentz force In physics, particularly electromagnetism, the Lorentz force is the combination of electric and magnetic force on a point charge due to electromagnetic fields. If a particle of charge q moves with vel...
 Hadamard–Rybczynski equation Hadamard–Rybczynski equation - Wikipedia
 Convection–diffusion equation The convection–diffusion equation is a combination of the diffusion and convection (advection) equations, and describes physical phenomena where particles, energy, or other physical quantities are tra...
 Euler–Tricomi equation In mathematics, the Euler–Tricomi equation is a linear partial differential equation useful in the study of transonic flow. It is named for Leonhard Euler and Francesco Giacomo Tricomi.It is hyperbol... Euler–Tricomi equation - Wikipedia
 Defining equation (physics) In physics, defining equations are equations that define new quantities in terms of base quantities. This article uses the current SI system of units, not natural or characteristic units.Physical...
 Dirac equation in the algebra of physical space The Dirac equation, as the relativistic equation that describesspin 1/2 particles in quantum mechanics can be written in terms of the Algebra of physical space (APS), which is a case of a Clifford alg...
 Einstein field equations The Einstein field equations (EFE; also known as "Einstein's equations") are the set of ten equations in Albert Einstein's general theory of relativity that describes the fundamental interaction of gr... Einstein field equations - Wikipedia
 Ampère's circuital law In classical electromagnetism, Ampère's circuital law, discovered by André-Marie Ampère in 1826, relates the integrated magnetic field around a closed loop to the electric current passing through the ... Ampère's circuital law - Wikipedia
 Primitive equations The primitive equations are a set of nonlinear differential equations that are used to approximate global atmospheric flow and are used in most atmospheric models. They consist of three main sets of b...
 Basset–Boussinesq–Oseen equation In fluid dynamics, the Basset–Boussinesq–Oseen equation (BBO equation) describes the motion of – and forces on – a small particle in unsteady flow at low Reynolds numbers. The equation is named after ... Basset–Boussinesq–Oseen equation - Wikipedia
 Darcy–Weisbach equation In fluid dynamics, the Darcy–Weisbach equation is a phenomenological equation, which relates the head loss — or pressure loss — due to friction along a given length of pipe to the average velocity of ...
 History of Maxwell's equations In electromagnetism, one of the fundamental fields of physics, the introduction of Maxwell's equations (mainly in "A Dynamical Theory of the Electromagnetic Field") was one of the most important aggr... History of Maxwell's equations - Wikipedia
 Einstein–Rosen metric The Einstein–Rosen metric is an exact solution of Einstein's field equation. It was derived by Albert Einstein and Nathan Rosen in 1937. It is the first exact solution of Einstein's equation that desc...
 Poisson's equation In mathematics, Poisson's equation is a partial differential equation of elliptic type with broad utility in electrostatics, mechanical engineering and theoretical physics. It is used, for instance, t...
 Allen–Cahn equation The Allen–Cahn equation (after John W. Cahn and Sam Allen) is a reaction-diffusion equation of mathematical physics which describes the process of phase separation in iron alloys, including order-diso...
 Schrödinger field In quantum mechanics and quantum field theory, a Schrödinger field, named after Erwin Schrödinger, is a quantum field which obeys the Schrödinger equation. While any situation described by a Schröding... Schrödinger field - Wikipedia
 Ideal gas law The ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. It was fir...