Watch

 Watch glass

is a circular concave piece of glass used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed, for heating a small amount of substance and as a cover for a beaker.


Below about 1200 degrees farenheit, glass doesn't change the way it looks. This is plenty of heat to be able to burn you, which is why “cold glass looks exactly like hot glass" is a rule to keep in mind in the lab or kitchen. Hot glass looks the same as cold glass.


for glass that covers your watch is also Watch glass.

Sapphire Crystal


Probably the most desirable watch glass is constructed of either synthetic or genuine sapphire. Generally synthetic sapphire is used. This is constructed of crystalised aluminum oxide and has the same physical attributes as the natural sapphire but without the colouring..




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