A tube is that container that serves to introduce a sample, substance or reagent, with which we are going to carry out an experiment, process or observation.
In the laboratory, test tubes are very useful, in which we introduce liquids and solids, of which we want to see their reaction with other products, or we simply want to transfer, filter, centrifuge or decant to another container.
They are made of glass, and of different diameter / capacity. The tubes are placed in a tube rack.
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