What is a watch glass in the laboratory equipments?

Question

What is a watch glass in the laboratory equipments?

Answer 1

Hi Graciela...a good question indeed...!

A watch glass is a circular, slightly concave piece of glass used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed, or as a cover for a beaker.

Thanx..Good Luck....!

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Answer 2

Images of watch glasses:

http://z.about.com/d/chemistry/1/0/D/U/p...

http://www.pelletlab.com/images/b_g_watc...

http://www.dargate.com/232_auction/232_i...

The watch glass is literally a glass to cover a watch .  The first watch glass was actually the "crystal" or glass cover of a pocket watch.