Watch glass
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Watch glass

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Description

A watch glass is a shallow, circular, concave glass dish with a slight lip around the edge. It is commonly used in laboratory settings for a variety of purposes, including: 1. Evaporation: Used as a cover for beakers or flasks to prevent evaporation and contamination of the contents during heating or storage. 2. Weighing: Used as a weighing boat to hold small amounts of solid substances for weighing on a balance. 3. Crystallization: Used as a surface for crystallization experiments, where solutions are allowed to evaporate to induce crystallization. 4. Holding samples: Used as a temporary holding vessel for small samples or for mixing small amounts of liquids or powders. Watch glasses are made of clear glass, allowing for easy observation of the contents, and are available in various sizes to accommodate different laboratory needs. They are essential tools in laboratories for performing a wide range of experiments and procedures.