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up quark definition

up quark

Particle Physics a type of quark with a mass of c. 0.002 to 0.008 GeV/c, a positive charge that is that of an electron, zero charm, and zero strangeness

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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