Watch glass
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Caesium_fluoride.jpg
Caesium_fluoride.jpg
Caesium fluoride sample on a watch glass
In a chemistry laboratory a watch glass is a small concave circular piece of glass. It is used either as surface to evaporate a liquid or as a cover for a beaker (non-sealing, it will slow but not stop evaporation and will prevent dust from falling into the beaker but not stop gas exchanges). When used as an evaporation surface it can be used to closely observe precipitates or crystallization; placing on a surface of contrasting color will improve visibility.
| Laboratory equipment |
| Agar plate | Aspirator | Bunsen burner | Calorimeter | Colorimeter | Centrifuge | Fume hood | Microscope | Microtiter plate | Plate reader | Spectrophotometer | Thermometer |
| Laboratory glassware |
| Beaker | Boiling tube | Büchner funnel | Burette | Conical measure | Cuvette | Laboratory flasks (Erlenmeyer flask | Florence flask | Volumetric flask | Buchner flask) | Gas syringe | Graduated cylinder | Pipette | Petri dish | Soxhlet extractor | Test tube | Thistle tube | Watch glass |