🌐EnglishEnglishItalianoPortuguês한국어中文日本語EntityQ5357201· pop 5· linked from 19 articlesmass gapenergy difference between ground state and lightest excited state(s)Available in 5 languages中文PortuguêsItaliano한국어via Wikidata sitelinks · CC0ConnectionspropagatorEntityquantum mechanicsEntityCategoriesQuantum field theory