Schlenk flask
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A Schlenk flask, or Schlenk tube is a reaction vessel typically used in air sensitive chemistry, invented by Wilhelm Schlenk. They have a side arm fitted with a teflon or ground glass stopcock which allows the vessel to be evacuated or filled with gases (usually inert gases like nitrogen or argon). These flasks are often connected to Schlenk lines which allow both operations to be done easily.
Schlenk flasks and Schlenk tubes are made of borosilicate glass such as Pyrex, usually used in the construction of laboratory glassware.
Schlenk flasks are round bottomed, while Schlenk tubes are elongated. They may be purchased off-the-shelf from laboratory suppliers, or made from round bottom flasks or glass tubing by a skilled glassblower.
