test tubes

Test tubes are small, cylindrical glass or plastic containers used in laboratories to hold, mix, and heat small amounts of liquids or chemicals. They provide a convenient way for scientists to observe reactions, perform experiments, or store samples. Typically open at the top, test tubes are often used with racks for organization and can be heated directly over a flame or in a water bath. Their simple design makes them essential tools for conducting a wide range of scientific investigations while allowing easy access and observation.