Thiele tube
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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.
Operation
Oil is poured into the tube, and then the "handle" is heated, either by a small flame or some other heating element. The shape of the Thiele tube allows for formation of convection currents in the oil when it is heated. These currents maintain a fairly uniform temperature distribution throughout the oil in the tube. The side arm of the tube is designed to generate these convection currents and thus transfer the heat from the flame evenly and rapidly throughout the heating oil. The sample, packed in a capillary tube, is attached to the thermometer, and held by means of a rubber band or a small slice of rubber tubing. The Thiele tube is usually heated using a microburner with a small flame.
Melting point determination
A sample in a sealed capillary, attached to a
Boiling point determination
A Thiele tube can be used to measure the boiling point of a liquid by the Siwoloboff method. A sample in a
References
- ^ Hunt, Ian R. (2013-09-23). "Melting point determination" (PDF). University of Calgary. Retrieved 2022-03-07.
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- ^ Hunt, Ian R. (2021-09-27). "Micro-boiling point measurement" (PDF). University of Calgary. Retrieved 2023-10-22.
- ^ "OECD Guideline for the Testing of Chemicals" (PDF). Retrieved 2023-10-22.
- ^ Nichols, Lisa (2022-05-05). "Step-by-Step Procedures for Boiling Point Determination". LibreTexts. Retrieved 2023-10-22.