For example to contain a sample to be weighed; or to make a chemical reaction at small scale; or to cover a beaker.
They are useful for staining samples of biological tissue as only a small amount of stain needs to be added which will then sit in the centre of the watch glass.
A watch glass is sometimes used to measure small amounts of solids and evaporate miscellaneous liquids/ chemicals in a laboratory.
The magnifying lens that a watchmaker uses for detail work is called a loop.
They are useful for staining samples of biological tissue as only a small amount of stain needs to be added which will then sit in the centre of the watch glass.
A watch glass hasn't a symbol.
A watchglass can be used as a beaker cover, but you can also place small amounts of chemicals on it and then heat it (for example, to evaporate some water from a wet chemical).From Wikipedia:A watch glass is a circular, slightly concave piece of glass used in chemistry as a surface to evaporate a liquid, or as a cover for a beaker. The latter use is generally applied to prevent dust or other particles entering the beaker; the watch glass does not completely seal the beaker, and so gas exchanges still occur. When used as an evaporation surface, a watch glass allows closer observation of precipitates or crystallisation, and can be placed on a surface of contrasting colour to improve the visibility overall. Watch glasses are so named because they are identical to the glass used for the front of old-fashioned pocket watches. In reference to this, large watch glasses are occasionally known as clock glasses.See the Related Questions and Web Links to the left for a picture of watch glass and more information about other laboratory apparatus.
For one, the US President uses bullet proof glass.
For one, the US President uses bullet proof glass.
because glass is transparent
Glass bending procedure without dents
Glass and soap
anyone