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Physics Definitions Start from Q

Quantum Chromo Dynamics (QCD)

The widely accepted modern theory of matter, based on the assumption that quarks are distinguished by differences in color and are held together (as in hadrons) by gluons.


A positively charged particle 2,000 times more massive than an electron that, with neutrons, forms all nuclear matter; a proton is a hadron and is made up of three quarks.

Quark-gluon plasma (QGP)

A "soup" of Nature's most basic particles, loosed from their usual confined state within hadrons. Thought to have existed a few millionths of a second after the Big Bang, before matter cooled and organized into hadrons and atoms. Also thought to exist at the centers of neutron stars.


A faint blue, star-like object commonly considered to be extremely distant, probably an unusual nucleus of a galaxy. It has a tendency to flare.


A quantity that cannot be divided into smaller increments forever, for which there exists a minimum, quantum increment.

Quantum Mechanic

Study of properties of matter using its wave properties.

Quantum Model of Atom

Atomic model in which only probability of locating electron is known.

Quantum Number

Integer ratio of energy to its quantum increment.

Quark Model

Model in which all particles that interact via the strong interaction are composed of two or three quarks.

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