up quark

up quark (plural up quarks)

  1. A quark having a fractional electric charge of +2/3 and a mass of about 1.5 to 4 MeV. Symbol: u
  • French: quark haut, quark up
  • Italian: quark up
  • Portuguese: quark up
  • Russian: ве́рхний кварк
  • Spanish: quark arriba

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