Test tube is a commonly used instrument in chemical laboratories. It is used as a reaction container for a small number of reagents. It is used at room temperature or when it is heated (it should be preheated before heating, otherwise the test tube may burst easily.). Test tubes are divided into common test tubes, test tubes with branches, and centrifuge test tubes. It is also one of the most overlooked consumables in our laboratory. How to extend the working life of test tubes?

This passage is going to talk about the following questions of test tube:

(1) Definition of test tube in chemistry

(2) Different shapes of test tubes

(3) Why is the bottom of the test tube curved instead of flat?

 

(1) Definition of test tube in chemistry

Test tubes used for general chemical work are usually made of Borosilicate Glass because of its relative heat resistance. Tubes made of anti-expansion Borosilicate Glass (mainly borosilicate glass or fused silica) can withstand high temperatures up to several hundred degrees Celsius.

Chemical tubes come in various lengths and widths, usually 10 to 20 mm wide and 50 to 200 mm long. The top usually has open lips to help pour out the contents. Chemical test tubes usually have flat, round or conical bottoms. Some test tubes can hold frosted glass stoppers or screw caps. They usually have a small area of frosted glass or white glaze near the top for marking with a pencil.

Chemists widely use test tubes to handle chemical substances, especially for qualitative experiments and tests. Their spherical bottom and vertical sides reduce quality loss during pouring, make it easier to flush, and facilitate monitoring of contents. The long, thin neck of the test tube slows down the diffusion of gas into the environment.

 

(2) Different shapes of test tubes

There are many different types of test tubes, such as flat test tubes, roll-open test tubes, fermentation test tubes and test tubes with branches.

The roll mouth test tube is a round bottom glass tube with a curled edge (or round mouth) at the mouth. The roll mouth (or round mouth) is used to increase the mechanical strength and at the same time facilitate clamping and not easy to fall off.

The fermentation test tube is a flat and round-bottomed test tube with a thin and short caliber (caliber 6mm, length 30mm).

A test tube with a side branch is a flat test tube with a side branch tube. Its side branch tube is mainly used to connect with the suction tube. The mouth of the tube is inserted into the filter funnel with a holed rubber plug to replace the micro filter bottle for micro filtration. Of receiving bottles. Graduated test tube: The shape is a round test tube. The volume scale mark is engraved on the tube body, which can directly read the measurement number, which is convenient to use.

 

(3) Why is the bottom of the test tube curved instead of flat?

You may be wondering why the bottom of the test tube is curved instead of flat.

One explanation is that test tube is easy to process, and it is easier to process a circle than a flat one. The other explanation is the knowledge of materials. When the bottom of the test tube is spherical, there will be no stress concentration points, but the flat ones are different. There will be stress concentration points, and one circle will reduce the life of the test tube.

 

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