Test tubes can be used to carry out various types of analysis.
A test tube is a piece made of glass that is used in chemical laboratories to carry out different types of analysis . These tubes are closed at one end and open at the other: in this way, it is possible to introduce substances inside.
It should be noted that a hollow element that is usually cylinder -shaped and usually has at least one open end is called a tube . Rehearsal , on the other hand, is the act and result of rehearsing (practicing or performing a test).
Characteristics of a test tube
Many times the test tube has a cap that allows it to be closed temporarily. This way, its contents can be preserved more easily, preventing spills or losses. Although most tubes are made of glass , there are also some made of polypropylene or other plastic materials that are disposable (they are discarded after use).
The test tubes, which can measure up to twenty centimeters long and whose width usually does not exceed two centimeters, are stored in a rack . This device, made of metal, plastic or wood, has openings where test tubes can be inserted. The rack, in this way, provides support for the tubes.
Test tubes are very important in chemical laboratories.
Its usefulness
In addition to all of the above, we cannot ignore that test tubes make it easier to transfer a liquid to another container thanks to their straight sides and round shape. And these two characteristics allow this action to be undertaken while losing a minimum of mass.
In the same way, you should also know that the long neck of these articles that are used in the laboratories of many companies and industries helps to slow down the diffusion of any vapors that may exist.
Use of test tubes
When test tubes are made of materials that can expand, they can be placed over a flame so that the substances inside react to the change in temperature. This, of course, cannot be done if the test tube is not fire resistant as the material can melt or fracture due to the high temperature.
When using any test tube, it is essential that a series of safety measures be followed in order to avoid very dangerous situations. Among the most significant are the following:
- It is essential that, at no time, the tube be directed towards the face when any preparation is being carried out or when a chemical reaction is being carried out. And if it were done, the person could cause everything from rashes of all kinds to burns or severe eye damage.
- In the same way, it is determined that it is necessary that when a tube is going to be placed on top of a heat source to heat up, it should always be held with wooden tongs and not by hand. This is the way to avoid burns.