Showing 1-43 of 43 results

…A statement that the values of two mathematical expressions are equal (indicated by the sign =)…

…a quadratic equation…

…The equation of state of an ideal gas, PV = nRT, where P = pressure, V = volume, T = absolute temperature, R = the gas constant, and n = the number of moles of gas…

…A differential equation expressing the properties of motion in waves…

…A speculative equation that gives an estimate of the likelihood of discovering intelligent extraterrestrial life in the galaxy, expressed as the product of a series of factors such as the number of stars, the fraction of stars with planets, the fraction of planets on which life evolves, the average lifetime of a civilization, etc. It was formulated by the US astronomer Frank Drake in 1961…

…One of Maxwell's equations.…

…The component of a situation, etc., which arises from or relates to human influence or behaviour.…

…An equation between two variables that gives a straight line when plotted on a graph…

…An equation which expresses the evolution in time of the probability distribution of the possible states of a system in terms of the microscopic processes involved.…

…An equation of a curve or surface expressed in polar coordinates.…

…An equation which states the relationship between the amount of power returning to a radar receiver and various factors affecting this (as the transmitter power, and the distances from the transmitter to the target and from the target to the receiver).…

…A polynomial equation whose Galois group is commutative or (in early use) cyclic.…

…A differential equation arising in connection with elliptically symmetrical systems, having the form d2 y/dx 2 + (a + b cos 2x)y = 0, where a and b are constants.…

…The correction required in scientific observations (originally in astronomy) to compensate for the habitual inaccuracy of an individual observer; (in extended use) the component of a situation which relates to or arises from an individual's personal qualities.…

…= Planck's formula.…

…The generalization of Laplace's equation produced by replacing the zero of the right-hand side by a constant or, more generally, by a specified function of position.…

…An equation of the second degree; specifically an equation of the form ax 2 + bx + c = 0, where a, b, and c are constants and x is unknown.…

…= equation of continuity.…

…An equation involving derivatives of a function or functions…

…A polynomial equation with integral coefficients for which integral solutions are required…

…An equation showing the relationship between the values of the pressure, volume, and temperature of a quantity of a particular substance…

…The difference between mean solar time (as shown by clocks) and apparent solar time (indicated by sundials), which varies with the time of year…

…Any of a set of equations each of which expresses one of the coordinates of a curve or surface as a function of one or more parameters.…

…An equation expressing the relation between the volume V of fluid flowing per second through a long narrow cylinder under conditions of Poiseuille flow, the viscosity of the fluid, and the dimensions of the cylinder, namely V = πr 4 p/8ηl, where p is the difference in pressure between the ends of the cylinder, η is the viscosity of the fluid, l is the length of the cylinder, and r is its radius.…

…(Originally) an equation whose roots can be divided into pairs of numbers, each the reciprocal of the other; (equivalently) an equation which is unchanged if the variable is replaced by its reciprocal (now rare); (in later use) an equation involving a reciprocal.…

…An equation relating the expected value of a dependent variable to the value of one or more independent variables.…

…An equation for the maximum current density of electrons emitted from a hot metal surface in terms of the temperature and work function of the surface.…

…A differential equation that forms the basis of the quantum-mechanical description of matter in terms of the wavelike properties of particles in a field. Its solution is related to the probability density of a particle in space and time…

…Mathematics. More fully Gaussor Gauss's characteristic equation. An equation expressing the curvature of a surface in terms of certain parameters of the surface.…

…Each of the one-dimensional equations of motion for a viscous fluid. Also: the vector equation combining these, which may be written d V/d t = − 1/ρ∇p + F + ν∇2 V + V) where V is the fluid velocity, ρ the density, p the pressure, F the total force per unit mass, and ν the kinematic viscosity.…

…An equation containing one or more partial derivatives…

…The Richardson equation, especially in one or other of its later representations.…

…An equation involving only the first derivative, second derivative, etc.…

…A situation or problem in which several factors must be taken into account…

…A set of four linear partial differential equations that summarize the classical properties of the electromagnetic field…

…Equations involving two or more unknowns that are to have the same values in each equation…

…Physical Chemical Onsager equation noun also Onsager's equation an equation that relates the conductance of an electrolytic solution to that of the pure solvent.…

…In full Pell equation, Pell's equation. A Diophantine equation of the form y 2 − ax 2 = 1, where x and y are integer variables, and a is an integer constant.…

…In full Pell equation, Pell's equation. A Diophantine equation of the form y 2 − ax 2 = 1, where x and y are integer variables, and a is an integer constant.…

…An equation involving only the first derivative, second derivative, etc.…

…Attributive Designating a mathematical model for calculating the value of stock options, as Black–Scholes model, Black–Scholes option pricing model, etc. Also: designating the formula or equation used in this model, as Black-Scholes equation, Black-Scholes formula, etc.…

…An equation involving only the first derivative, second derivative, etc.…

…Mathematics. More fully Gaussor Gauss's characteristic equation. An equation expressing the curvature of a surface in terms of certain parameters of the surface.…