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Drawing of a Thiele tube with red arrows showing convection current

A photograph of a Thiele tube. The oil level is a little low now to compensate for expansion when heating commences.

The Thiele tube, named after the German chemist Johannes Thiele, is a laboratory glassware designed to contain and heat an oil bath. Such a setup is commonly used in the determination of the melting point or boiling point of a substance. The apparatus resembles a glass test tube with an attached handle.