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A shallow circular dish used as a cover or surface.
Also known as: Cover glass laboratory, Clock glass
A watch glass is drawn as a shallow curved circular disc, used as a loose cover for a beaker, a surface for weighing or a dish for evaporating small amounts.
Serves as a loose cover, a weighing surface or a small evaporating dish.
Contexts: Laboratory
Covers loosely by design, letting vapour escape while keeping dust out, which is why it is not a sealing lid.
Contexts: Laboratory
A shallow curved circular disc drawn in section as a low arc.