a cylindrical funnel for filtration, usually of porcelain or plastic, that includes a perforated plate on which a filter paper is placed. It is generally used with a vacuum.
Then filter on a Büchner funnel fitted with a filtering aid or on a sintered filter.
Good to know
It is commonly thought to be named for the Nobel Laureate, Eduard Buchner (without umlaut), but it is actually named for the industrial chemist Ernst Büchner.
