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A watch glass is a little circle dish of glass or pyrex (heat-safe-glass). it is a smooth shallow concave (cup-like) plate. It is used to watch a little amount of solution evaporate, leaving behind a little pile of whatever was dissolved in it. Salt-water, for example, would dry to leave a little pile of salt in the middle.

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17y ago
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Q: How does a watchglass look like?
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