Home›Foundational quantum physics›old quantum theory🌐EnglishEnglishBahasa IndonesiaEspañolFrançaisItalianoNederlandsPolskiPortuguêsTiếng ViệtTürkçeРусскийالعربيةفارسی한국어中文日本語EntityQ2566926· pop 21· linked from 298 articlesold quantum theoryset of heuristic corrections to classical physics that served as a predecessor to modern quantum mechanics (1900–1925)Available in 21 languagesEspañolFrançais中文日本語РусскийPortuguêsItalianoالعربيةBahasa IndonesiaCatalanConnectionsSchrödinger's catEntityBohr modelEntityCategoriesFoundational quantum physicsHistory of physicsOld quantum theory