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Beaker (glassware)
From Wikipedia, the free encyclopedia
A beaker is a simple container for liquids, very commonly used in laboratories. Beakers are generally cylindrical in shape, with a flat bottom. Beakers are available in a wide range of sizes, from 1mL up to several litres.
They may be made of glass (very often Pyrex) or of plastic. Beakers used for holding solutions of corrosive chemicals, such as acids, should be made of Teflon or other materials resistant to corrosion, eg borosilicate glass.
Beakers may be covered, perhaps by a watch glass, to prevent contamination or loss of the contents. Beakers are often graduated, marked on the side with lines indicating the volume contained. For instance, a 250 mL beaker might be marked with lines to indicate 50, 100, 150, 200, and 250 mL of volume. The accuracy of these marks can vary from one beaker to another.
A beaker is distinguished from a flask by having sides which are straight rather than sloping. Beakers are used more often in general chemistry than flasks.
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| Equipment | Agar plate • Aspirator • Autoclave • Bunsen burner • Calorimeter • Colony counter • Colorimeter • Laboratory centrifuge • Fume hood • Glove box • Incubator • Homogenizer • Laminar flow cabinet • Magnetic stirrer • Microscope • Microtiter plate • Plate reader • Spectrophotometer • Stir bar • Thermometer • Vortex mixer • Static mixer |
| Glassware | Beaker • Boiling tube • Büchner funnel • Burette • Cold finger • Condenser • Conical measure • Crucible • Cuvette • Laboratory flasks (Erlenmeyer flask, Round-bottom flask, Florence flask, Volumetric flask, Büchner flask, Retort) • Gas syringe • Graduated cylinder • Glass tube • NMR tube • Pipette • Petri dish • Pycnometer •Schlenk flask • Separating funnel • Soxhlet extractor • Test tube • Thiele tube • Thistle tube • Watch glass |