A watch glass is a circular, slightly convex-concave piece of borosilicate glass used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed, or as a cover for a beaker. The latter use is generally applied to prevent dust or other particles from entering the beaker; the watch glass does not completely seal the beaker, and so gas exchanges still occur.
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A watch glass in chemistry is a concave, round piece of glass that can be used to cover beakers or flasks, keep solids while weighing, and evaporate liquids. Additionally, it provides a platform for examining crystallization patterns or precipitates during evaporation.
A watch glass in chemistry is a concave, circular glass dish that is mostly used for weighing small samples, covering beakers or flasks, and evaporation. It is also used as a lid for different glassware and to let crystals dry after filtering.
A watch glass is mostly used in labs to cover flasks and beakers, shielding the contents from evaporation and contamination. In addition, it serves as a surface for holding and examining small samples, as well as for evaporating liquids and weighing solids.
A watch glass can be used for a number of tasks in the laboratory, including as retaining solids while weighing, evaporating liquids, and covering beakers or flasks to keep them clean. Gas exchange is still possible even if it can cover a beaker since it doesn't form a seal that is airtight.
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