Home›Browse›proper length🌐EnglishEnglishDeutschEspañolFrançaisTiếng ViệtРусскийالعربية한국어中文日本語EntityQ3153623· pop 6· linked from 156 articlesproper lengthSign in to saveAlso known as rest lengthlength of an object in the object's rest frameWikidata factsSubclass ofphysical quantityShow 2 more factsused bytheory of relativitydifferent fromproper distancevia Wikidata · CC0Available in 6 languagesFrançaisРусскийالعربيةTiếng Việt한국어via Wikidata sitelinks · CC0