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erlenmeyer flask
An Erlenmeyer flask or conical flask〔. "Erlenmeyer flask" is American English; "conical flask" is British English.〕 is a type of laboratory flask which features a flat bottom, a conical body, and a cylindrical neck. It is named after the German chemist Emil Erlenmeyer (1825–1909), who created it in 1860.〔Emil Erlenmeyer, "Zur chemischen und pharmazeutischen Technik," ''Zeitschrift fuer Chemie und Pharmacie'', vol. 3 (January 1860), 21-22. He wrote that he first displayed the new flask at a pharmaceutical conference in Heidelberg in 1857, and that he had arranged for its commercial production and sale by local glassware manufacturers.〕
== Design ==
Erlenmeyer flasks have wide bases, with sides that taper upward to a short vertical neck. They may be graduated, and often spots of ground glass or enamel are used where they can be labeled with a pencil. It differs from the beaker in its tapered body and narrow neck.〔(Laboratory Glassware. 17 November 2011 )〕
The mouth of the Erlenmeyer flask can have a beaded lip that can be stoppered using a piece of cotton wool, rubber bung, or similar. Alternatively, the neck may be fitted with a female ground glass joint to accept a glass stopper.
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