A volumetric flask is a piece of laboratory apparatus, a type of laboratory flask, calibrated to contain a precise volume at a certain temperature. Wikipedia

Type of laboratory flask Wikidata

A glass flask used in a laboratory for holding chemical liquids and solutions. They are similar in shape to a Florence flask, but with a longer neck and wider flat bottom. The neck is marked so that a particular volume of liquid can be measured with high precision. Wiktionary

Laboratory flask. Wiktionary (translation)