Pumping(redirected from stomach pumping)
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(in quantum electronics), the process of creation of a nonequilibrium state of a substance under the action of electromagnetic fields or collisions with charged or neutral particles, upon abrupt cooling of preheated gaseous masses, and so on. Pumping may shift a substance from a state of thermal equilibrium to an active state (with a population inversion), in which it can amplify and generate electromagnetic waves.
The term “pumping” has spread beyond the bounds of quantum electronics—it is used in radio engineering and optics to designate the processes by which the active elements of parametric systems are affected.