What is a test tube?

A test tube is a common piece of laboratory glassware used for holding, mixing, or heating small quantities of liquid or solid substances. Test tubes are typically cylindrical in shape with a rounded bottom and open top, and they come in various sizes ranging from a few milliliters to several milliliters in capacity.

Test tubes are made of borosilicate glass or plastic, and they are often used in experiments and analyses in fields such as chemistry, biology, and medicine. They can be easily sterilized and reused, making them a cost-effective option for conducting multiple experiments.

In addition to holding liquids, test tubes can also be used for heating substances over a Bunsen burner or in a water bath. Some test tubes also have a lip or rim for easy pouring and handling.

Test tubes are usually stored in test tube racks to keep them organized and prevent breakage. They are also commonly labeled with a marker or adhesive label to identify the contents or experiments being conducted.

Overall, test tubes are a versatile and essential piece of equipment in any laboratory setting.