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up quark

noun, Physics.
the quark having electric charge 2/3 times the elementary charge and strangeness and charm equal to 0.
Also called u quark.
1975-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for up quark
  • It is also proven that a down quark disappears and an up quark is produced.
  • There are two up quarks and a down quark in a proton, and two down quarks and an up quark in a neutron.
up quark in Science
up quark
A quark with a charge of +2/3. Its mass is approximately 10 times the electron mass and is the least mass of all quarks. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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