up quark

up quark (plural up quarks)

1. (particle physics) A quark having a fractional electric charge of ${\displaystyle +{\frac {2}{3}}}$ and a mass of about 1.5 to 4 MeV.
   Symbol: ${\displaystyle u}$

• quarks: up quark · down quark · charm quark · strange quark · top quark/truth quark · bottom quark/beauty quark ^[edit]