Displacement

Displacement may refer to:

Mathematics and physics

 * Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path covered to reach the final position is irrelevant.
 * Particle displacement, a measurement of distance of the movement of a particle in a medium as it transmits a wave (represented in mathematics by the lower-case Greek letter ξ)
 * Displacement field (mechanics), an assignment of displacement vectors for all points in a body that is displaced from one state to another
 * Electric displacement field, as appears in Maxwell's equations
 * Wien's displacement law, a relation concerning the spectral distribution of blackbody radiation
 * Angular displacement, a change in orientation of a rigid body, the amount of rotation about a fixed axis.

Engineering

 * Engine displacement, the total volume of air/fuel mixture an engine can draw in during one complete engine cycle
 * Displacement (fluid), an object immersed in a fluid pushes the fluid out of the way
 * Positive displacement meter, a pump or flow meter which processes a definite fluid volume per revolution
 * Displacement has several meanings related to ships and boats
 * Displacement hull, where the moving hull's weight is supported by buoyancy alone and it must displace water from its path rather than planing on the water's surface
 * Displacement speed, a rule of thumb for non planing watercraft to estimate their theoretical maximum speed
 * Displacement (ship), the weight of a ship
 * Insulation displacement connector, a type of electrical connector
 * Displacement mapping, a technique in 3D computer graphics

Chemistry

 * Single displacement reaction, a chemical reaction concerning the exchange of ions
 * Double displacement reaction, a chemical reaction concerning the exchange of ions
 * Radioactive displacement law of Fajans and Soddy, elements/isotopes created during radioactive decay

Geology

 * Earth Crustal Displacement, an aspect of the Pole shift hypothesis

Medicine

 * Displacement (orthopedic surgery), change in alignment of the fracture fragments

Social sciences

 * Displacement (linguistics), the ability of humans (and possibly some animals) to communicate ideas that are remote in time and/or space
 * Forced displacement, by persecution or violence
 * Displacement (psychology), a sub-conscious defense mechanism
 * Displacement (parapsychology), a statistical or qualitative correspondence between targets and responses.
 * Development-induced displacement, the displacement of population for economic development
 * Displacement may occur during gentrification.

Sport

 * Displacement (fencing), a movement that avoids or dodges an attack

Other

 * Child displacement