All Words Glossary

Glossary of Physics Terms
beginning with letter Q
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QCD Tweet Definition of QCD Like Definition of QCD on Facebook
initialism
  1. (physics) quantum chromodynamics, Quantum Chromodynamics
  2. (lean manufacturing) Quality, Cost, Delivery
QED Tweet Definition of QED Like Definition of QED on Facebook
initialism
  1. quod erat demonstrandum, Quod erat demonstrandum (Latin what had to be proved or what was to be demonstrated).
  2. quantum electrodynamics
quality Tweet Definition of quality Like Definition of quality on Facebook
noun (qualit, ies)
  1. (uncountable) Level of excellence
This school is well-known for having teachers of high .
Quality of life is usually determined by health, education, and income.
  1. (countable) A property or attribute that differentiates a thing or person.
One of the qualities of pure iron is that it does not rust easily.
While being impulsive can be great for artists, it is not a desirable for engineers.
security, Security, stability, and efficiency are good qualities of an operating system.
  1. (thermodynamics) In a two-phase liquid-vapor mixture, the ratio of the mass of vapor present to the total mass of the mixture.
  2. (archaic) high, High social position.
A peasant is not allowed to fall in love with a lady of .
membership, Membership of this golf club is limited to those of and wealth.
  1. The correspondence between a goal and its outcome -- between intent and result of action.
quanta Tweet Definition of quanta Like Definition of quanta on Facebook
noun
  1. Plural of quantum.
quantize Tweet Definition of quantize Like Definition of quantize on Facebook
verb (quantiz, ing)
  1. (context, transitive, physics) To limit the number of possible values of a quantity, or states of a system, by applying the rules of quantum mechanics
  2. (context, transitive, telecommunication) To approximate a continuously varying signal by one whose amplitude can only have a set of discrete values
quantum chromodynamics Tweet Definition of quantum chromodynamics Like Definition of quantum chromodynamics on Facebook
noun
  1. (physics) A quantum field theory in particle physics which describes the strong interaction of quark, quarks and gluon, gluons employing the concept of color charge.
quantum electrodynamics Tweet Definition of quantum electrodynamics Like Definition of quantum electrodynamics on Facebook
noun (abbreviated as QED)
  1. (physics) the study of the interaction of electromagnetic radiation with electrically charged matter within the framework of relativity and quantum mechanics
quantum mechanics Tweet Definition of quantum mechanics Like Definition of quantum mechanics on Facebook
noun
  1. (physics) That branch of physics which studies matter and energy at the level of atoms and other elementary particles, and substitutes probabilistic mechanisms for classical Newtonian ones.
quantum number Tweet Definition of quantum number Like Definition of quantum number on Facebook
noun
  1. (quantum) One of certain integers or half-integers that specify the state of a quantum mechanical system (such as an electron in an atom).
quantum state Tweet Definition of quantum state Like Definition of quantum state on Facebook
noun
  1. (physics) any of the possible states of a quantum mechanical system
quark Tweet Definition of quark Like Definition of quark on Facebook
noun
  1. (particles) In the Standard Model, an elementary subatomic particle which forms matter. Quarks are never found alone in nature and combine to form hadrons, such as protons and neutrons.
1993: Gell-Mann won the linguistic battle once again: his choice, a croaking nonsense word, was "quark". (After the fact, he was able to tack on a literary antecedent when he found the phrase "Three quarks for Muster Mark" in Finnegans Wake, but the physicists quark was pronounced from the beginning to rhyme with "cork".) — w:James Gleick, James Gleick, Genius: Richard Feynman and Modern Physics

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