🌐EnglishEnglishDeutschEspañolFrançaisItalianoPolskiSvenskaTürkçeРусскийالعربيةفارسی한국어中文日本語EntityQ568855· pop 23· linked from 71 articleshelicityprojection of spin along the direction of momentumAvailable in 23 languagesEspañolFrançaisDeutsch中文日本語РусскийItalianoالعربيةArmenianCatalanConnectionsphysicsEntityquantum mechanicsEntityCategoriesQuantum field theory