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- Watch glass is a circular, slightly convex-concave piece of glass.
- This is used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed or as a cover of a beaker.
- Watch glasses are called so because these are similar to the one used for the front of old-fashioned pocket watches.
- These are also used for placing/holding small samples for observation under a low-power microscope.
- Watch glasses when used as an evaporation surface, allows closer observation of precipitates or crystallization as well as it can be placed on a surface of contrasting color to improve the visibility.