🌐EnglishEnglishDeutschEspañolFrançaisРусский中文EntityQ1634662· pop 7· linked from 35 articlesHughes–Drever experimentAlso known as clock comparison experiments, mass isotropy experiments, energy isotropy experimentscomparing energy levels of nucleons or electronsAvailable in 7 languagesEspañolFrançaisDeutschРусскийCatalanMacedonianvia Wikidata sitelinks · CC0Connectionsisotope of mercuryEntitytorsion springEntityCategoriesTests of general relativityTests of special relativity