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quark
subject			fact

quark	has antiparticle antiquark
	has spin 1/2
	is a part of nucleon
	has definition The hypothetical constituent of the elementary particles that interacts via glue forces. Originally only three quarks were hypothesized; today it appears that six are required. For a variety of theoretical reasons, free quarks can never be seen.
	has definition Fundamental particle of which protons, neutrons and electrons are now thought perhaps to be made up. There are possibly three or four types of quark. It is even possible that quarks themselves may be made up of still more fundamental particles.
	has definition A sub-atomic particle which is a fundamental building block of the hadrons.
	has definition A fermion with fractional electric charge.
	has definition A particle that is acted upon by the strong force. Quarks exist in six varieties: up, down, charm, strange, top, bottom and three "colors" (red, green, blue).
	has definition One of the fundamental, indestructible particles of nature, out of which many other subatomic particles are made. Five types of quarks have been discovered, and it is believed that a sixth also exists. Quarks interact mainly via the strong nuclear force and the electromagnetic force.
	has definition Fundamental particles from which all hadrons are made. According to the theory of quantum chromodynamics, protons, neutrons, and their higher-energy cousins are composed of trios of quarks, while the mesons are each made of one quark and one antiquark. Held together by the strong nuclear force, quarks are not found in isolation in nature today; see asymptotic freedom.
	is a kind of parton
	is a kind of fermion
	is a kind of charged particle
fermion	has quantum behavior Fermi-Dirac statistics
	obeys exclusion principle
charged particle	is accelerated by electric or magnetic fields
	has charge non-zero
particle	has frequency inversely proportional to the wavelength
	has wavelength inversely proportional to its momentum
	has mass
hypothetical particle	has acceptance status hypothetical
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of quark :

• heavy quark (3 kinds, 12 facts)
• light quark (3 kinds, 10 facts)
• primordial quark (2 facts) - All baryons and mesons are believed to be composed of quarks, which are elementary particles of fractional charge. In the high-density, hot-temperature phase of the very early universe, prolific numbers of quarks would have been present in equilibrium with the other elementary particles. As the universe expanded and cooled, some of these quarks may have been frozen out. To what extent independent free quarks could survive is an unresolved issue of elementary particle physics.

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