noun
up quark; u quark
Technical term in particle physics; one of the elementary particles that make up protons and neutrons.
陽子はアップクォーク二つとダウンクォーク一つからできている。
A proton is made of two up quarks and one down quark.
ダウンクォーク is the down quark, which together with the up quark forms protons and neutrons.
クォーク is the general term for quarks; アップクォーク is a specific type.
Variant with interpunct; less common but still used in some technical contexts.
Borrowed from English 'up quark'.