Watch Glass is a type of laboratory glassware that is used to hold small quantities of solids or liquids. It is a circular, slightly concave piece of glass that resembles a small dish or shallow bowl.
Watch glasses are often used as covers for beakers, flasks, and other laboratory containers to prevent contamination, evaporation, or splashing of the contents. They are also used for evaporation purposes, as they provide a larger surface area for the substance to evaporate compared to a test tube or other container.
Watch glasses come in a variety of sizes, ranging from a few millimeters to several inches in diameter. They are made from either borosilicate or soda-lime glass, depending on the intended use and level of heat resistance required.
In addition to their use in laboratory settings, watch glasses can also be found in various other applications, such as in the culinary industry for covering food dishes or as a surface for mixing spices.