beaker

Imagine a scientist carefully mixing colorful liquids—chances are they are using this common lab flask. It is usually a sturdy cylindrical glass or plastic vessel with a flat bottom and a wide mouth, designed for easy stirring, holding, and heating. It is the quintessential workhorse of the lab, also handy for preparing solutions before transferring to more precise equipment.

These containers are often marked with volume lines, but those marks are approximate; you usually switch to a graduated cylinder or volumetric glassware when exact measurement is required. In everyday scientific English, this vessel is tied most closely to practical, hands-on experimentation rather than fine metrology.

A beaker is a wide-mouthed, cylindrical container used mainly in laboratories for stirring, mixing, and heating liquids, but also for holding samples and performing quick reactions. You’ve probably seen one in any chemistry demonstration where liquids are combined, color changes are tracked, or compounds are heated gradually.

Most laboratory examples are made from borosilicate glass because it tolerates heat and sudden temperature changes better than regular glass. Plastic versions exist too, especially for non-heat tasks where chemical resistance and cost matter more than temperature tolerance.

Although many are graduated with volume lines, those markings are usually meant for rough estimates. For precision work, students and scientists prefer pipettes, graduated cylinders, or volumetric glassware. The wide opening of this vessel, however, makes it practical for adding ingredients, stirring, and observing what’s happening inside.

The word is generally tied to the practical object itself in daily use, but writers sometimes use it metaphorically to mean a vessel-like container of emotion, memory, or experience. In regular usage, though, readers almost always picture a practical lab container ready on a bench for the next experiment.