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A marble is a small spherical often made from glass.
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Test tubes are widely used by chemists to handle chemicals, especially for qualitative experiments and assays. Test tubes are convenient containers for heating small amounts of liquids or solids with a Bunsen burner or alcohol burner. The tube is usually held by its neck with a clamp or tongs.
An evaporating dish or watch glass is a piece of laboratory glassware used for the evaporation of solutions and supernatant liquids, and sometimes to their melting point.
Circular gas jar covers, made of sheet glass.
U–tube filled with a sodium hydroxide is used for a cleaned and dried gas. U–tube filled with a 1 mol dm–3 aqueous potassium nitrate solution is used as a permanent salt bridge. U–tube is a device used for water electrolysis, for laboratory hydrogen and oxygen obtaining.
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