Laboratory flask

A laboratory vessel with a narrow neck and a wider body, used to contain, mix, heat, or measure liquids.

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Borosilicate glass: A heat-resistant glass containing silica and boron trioxide, used in laboratory equipment. Its low thermal expansion makes it suitable for flasks exposed to heating and cooling.
Erlenmeyer flask: A conical laboratory flask with a flat base and narrow neck. Its sloped sides allow liquids to be swirled with less risk of splashing.
Reflux: A process that boils a liquid and condenses its vapor back into the reaction vessel. A round-bottom flask commonly holds the heated mixture beneath a reflux condenser.
Beaker: A wide-mouthed cylindrical vessel used to hold, mix, and heat liquids. Its open shape offers easier access, while a flask's narrow neck helps limit splashing.
Volumetric glassware: Laboratory glassware calibrated to contain or deliver specified liquid volumes. Flasks belong to this wider family, although only some are designed for precise measurement.
Volumetric flask: A calibrated flask designed to contain one precise volume of liquid. Its single calibration mark supports accurate preparation of standard solutions.
Distillation: A separation process that vaporizes a liquid and condenses the vapor elsewhere. Flasks hold the heated mixture or collect distilled liquid in many setups.
Test tube: A small cylindrical tube used to contain or heat small samples. Test tubes handle small quantities, while flasks suit larger volumes and connected apparatus.
Ground glass joint: A tapered glass connection that joins laboratory apparatus through closely fitted surfaces. Standard joints let flasks connect to condensers, adapters, and other apparatus.
Round-bottom flask: A spherical flask used for heating and chemical reactions. Its shape distributes heat evenly and fits common reflux and distillation setups.