Definition of
test tube
It is called tube to a hollow element that is usually cylindrical in shape and that usually has at least one open end. Rehearsalon the other hand, is the act and the result of rehearsing (practicing or performing a test).
A test tube It is a piece made with glass which is used in the chemical laboratories to perform 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.
Many times the test tube has a plug that allows you to close them temporarily. This way you can more easily preserve your content, preventing spills or losses. Although most of the tubes are made of glass, there are also some of Polypropylene or other plastic materials that are disposable (discarded after use).
The test tubes, which can be up to eight inches long and usually no more than two inches wide, are stored in a rack. This device, made of metal, plastic or wood, has openings where the test tubes can be inserted. The rack thus provides support for the tubes.
In addition to all of the above, we cannot ignore the fact that test tubes make it easier to transfer a liquid to another container thanks to the fact that they have straight sides and that they have a round shape. And it is that these two characteristics allow this action to be undertaken losing the minimum of mass.
In the same way, it is also necessary to know that the long neck of those articles that are used in the laboratories of many companies and industries what they do is help slow down the diffusion of vapors that may exist.
When test tubes are made with materials which can expand, can be placed over a flame so that the substances it houses 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 from the high temperature.
When using any test tube, it is established that it is essential to comply with a series of safety measures in order to avoid very dangerous situations for those who use them. Specifically, among the most significant are the following:
-It is essential that, at no time, is the tube directed towards the face when a preparation is being carried out or when a chemical reaction is taking place. And it is that if it were done, the person could cause from eruptions of all kinds to burns or severe damage to the eyes.
-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 is always taken with wooden tongs and not by hand. This is the way to avoid severe burns.