🌐EnglishEnglishDeutschFrançaisItaliano中文日本語EntityQ400090· pop 6column densityAlso known as column mass density, columnar mass densitynumber of units of matter observed along a line of sight that has an area of observationAvailable in 6 languagesFrançaisDeutsch中文日本語Italianovia Wikidata sitelinks · CC0Connectionssurface densityEntity