Multi-neck flask

Three-necked flask with parallel side necks

Two-necked flask (left) with an inclined side neck and a three-necked flask (right) with two inclined side necks.

Front view of the pistons and three-necked version with parallel side necks.

Multi-neck flasks are used in chemical laboratories as vessels in synthetic chemistry for distillation , extraction , synthesis and the like. They are usually made of glass.

Multi-neck flasks are round-bottom flasks - or more rarely pointed flasks  - on which there are two, three or more necks (openings) provided with a ground joint . These openings are used to open the piston at the same time, for. B. to connect to a cooler or stirrer as well as measuring devices or a dropping funnel. Depending on the number of openings, the flasks are called round-bottom flasks (one-necked flasks) and two- or three-necked flasks. In the case of two- or three-necked flasks, the side necks are either parallel to the centrally attached neck or inclined outwards by 7 ° to 20 °.

A double balloon flask glass that was already used in the Middle Ages was called nunnenglas ("nun's glass").

Individual evidence

1. ^ Brockhaus ABC chemistry . VEB FA Brockhaus Verlag, Leipzig 1965, pp. 702-703.
2. ↑ Nun's glass. In: Jacob Grimm , Wilhelm Grimm (Hrsg.): German dictionary . tape 13 : N, O, P, Q - (VII). S. Hirzel, Leipzig 1889, Sp. 884 ( woerterbuchnetz.de ).
3. ↑ Jürgen Martin: The 'Ulmer Wundarznei'. Introduction - Text - Glossary on a monument to German specialist prose from the 15th century. Königshausen & Neumann, Würzburg 1991 (= Würzburg medical-historical research. Volume 52), ISBN 3-88479-801-4 , p. 154 (also medical dissertation, Würzburg 1990).