In a test tube small reactions or experiments are performed. There are many different types of tubes. For example some have connectors, some are etched for measurements, some are hardened for durability.
Nun tubo de ensaio lévanse a cabo reaccións ou experimentos pequenos. Hai moitos tipos diferentes. Por exemplo, algúns teñen conectores, outros contan con marcas para medir e outros son especialmente resistentes.