equation of motion
61Defining equation (physics) — For common nomenclature of base quantities used in this article, see Physical quantity. For 4 vector modifications used in relativity, see Four vector. Very often defining equations are in the form of a constitutive equation, since parameters of… …
62Debye-Hückel equation — The Debye Hückel limiting law, named for its developers Peter Debye and Erich Hückel, provides one way to obtain activity coefficients Ref|Harris. Activities, rather than concentrations, are needed in many chemical calculations because solutions… …
63Raychaudhuri equation — In general relativity, Raychaudhuri s equation is a fundamental result describing the motion of nearby bits of matter.The equation is important as a fundamental lemma for the Penrose Hawking singularity theorems and for the study of exact… …
64Schrödinger equation — Physics. the wave equation of nonrelativistic quantum mechanics. Also called Schrödinger wave equation. Cf. wave equation (def. 2). [1950 55; after E. SCHRÖDINGER] * * * Fundamental equation developed in 1926 by Erwin Schrödinger that established …
65Breit 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) interacting electromagnetically to the first …
66Landau–Lifshitz–Gilbert equation — In physics, the Landau Lifshitz Gilbert equation , named for Lev Landau and Evgeny Lifshitz and T. L. Gilbert, is a name used for a differential equation describing the precessional motion of magnetization M in a solid. It is a modification by… …
67Drag equation — In fluid dynamics, the drag equation is a practical formula used to calculate the force of drag experienced by an object due to movement through a fully enclosing fluid. The equation is attributed to Lord Rayleigh, who originally used L2 in place …
68Lotka–Volterra equation — The Lotka–Volterra equations, also known as the predator prey equations , are a pair of first order, non linear, differential equations frequently used to describe the dynamics of biological systems in which two species interact, one a predator… …
69Drake equation — This article is about Frank Drake s equation. For the Tub Ring music album, see Drake Equation (album). The Drake equation (sometimes called the Green Bank equation or the Green Bank Formula) is an equation used to estimate the number of… …
70Hasegawa-Mima equation — The Hasegawa Mima equation, named after Akira Hasegawa and Kunioki Mima, is an equation that describes a certain regime of plasma, where the time scales are very fast, and the distance scale in the direction of the magnetic field is long. In… …
