Thiele tube, what is it and how much does it cost?

November 2, 2021

The Thiele tube is a device that cannot be missing in any laboratory. It owes its name to the famous German chemist Johannes Thiele who designed it to determine a melting point. It is a glass tube, very similar in appearance to a test tube, but with the particularity that this tube has a handle or arm. The basic function of this glass tube is to contain and heat oil.

What is the Thiele Tube?

The Thiele Tube is the instrument used in the laboratory that is used to determine the melting point, but what is the melting point? The explanation is easy and simple. The melting point is that exact point at which an element changes from a solid state to a liquid. To find this point, you have to apply heat. And this is where the Thiele tube becomes a very necessary instrument. Due to its anatomy, it becomes perfect for determining the melting point.

The handle or arm design of the Thiele tube is decisive in finding the melting point. But because heat is applied to the handle or arm, it is not a good idea to pick up or hold the tube there. In any case, before applying heat to the tube, the oil must be poured and due to the particular shape of said tube, the content will begin to heat up evenly. The oil will have the same temperature in every appliance.

How is it possible that the oil is at the same temperature throughout the tube?

All the oil contained in the tube will take the same temperature because when the tube begins to heat with the flame of the Bunsen burner or other device. The oil begins to circulate and a current is formed, which is what allows the liquid inside the tube to acquire a uniform temperature.

How is the Thiele tube used?

The oil must be poured into the tube, and then the handle or handle of the tube is heated. It is heated by a small flame or with some other device that has the ability to heat the handle of the tube. The Thiele tube design allows convection currents to form in the oil when it is heated. These streams serve and are necessary to maintain a sufficiently uniform temperature distribution in the oil contained in the Thiele tube .

The Thiele tube contains a lateral arm or control and it has been designed to generate these convection currents and thus be able to transfer the heat of the flame in a sufficiently divided and uniform way through the oil. The sample, packed in a capillary tube, is attached to the thermometer and held by means of a rubber band or a small circumference of rubber tube. The Thiele tube should generally be heated using the Bunsen burner or a micro burner. The flame must be small.

How does the Thiele Tube work?

For the Thiele tube to function properly, it must contain oil or another liquid substance such as glycerin. They must be those liquids with higher melting points . Then you have to proceed to introduce the capillary with the sample inside and the thermometer next to it. The thermometer should not make contact with the wall of the tube. It must be submerged, but never come into contact.

The next and last step is to proceed to heat the liquid. It is heated with fire, which is applied directly to the handle or arm of the tube. The Thiele tube is used to determine the ebibition of the liquid .

The boiling point is determined when the liquid becomes gaseous, that is, when it begins to boil and the exact temperature at which it boils is taken as the boiling point.

The shape of the Thiele tube makes the oil circulate and the temperature is kept uniform by the convection currents that occur. These currents fulfill the function of transporting heat and in order to carry out the process successfully, the temperature must increase slowly and progressively.

What is the melting point?

The melting point is determined by the temperature at which a solid turns into a liquid. This happens at constant temperatures and it is an intensive property of matter. This means that to reach the melting point, matter does not depend on mass or size, but on the temperature at which that matter changes state.

What is the boiling point?

The boiling point is defined as the precise moment in which the change of state in matter occurs. It goes from a liquid to a gaseous state. Specifically, this concept refers to the temperature that causes the vapor pressure of a liquid to equal the vapor pressure of the medium in question.

In Thiele’s tube. How is the boiling point determined?

The sample in the fusion tube or Thiele tube is attached to a thermometer, using a rubber band, and dipped into the tube. A sealed capillary, with the open end pointing down, is placed in the fusion tube. The Thiele tube heats up; Dissolved gases evolve out of the sample first. Once the sample begins to boil, heating stops and the temperature begins to drop. The temperature at which the liquid sample is drawn into the sealed capillary is the boiling point of the sample.

Friedrich Karl Johannes Thiele was a German chemist and a leading professor at various universities, including those in Munich and Strasbourg. He developed many laboratory techniques related to the isolation of organic compounds.

Dr. Loony Davis5
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Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

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