Final answer:
A test tube holder is used in chemistry experiments to provide support and stability to test tubes, preventing them from rolling or tipping over. It is made of metal and has a spring-loaded grip or clamps. Its main functions are to hold test tubes and protect users from burning their hands.
Step-by-step explanation:
A test tube holder is a laboratory apparatus used to hold test tubes during experiments or when heating substances in a test tube over a flame. The main functions of a test tube holder are to provide support and stability to the test tube so that it doesn't roll or tip over, and to protect the user from burning their hands when holding a hot test tube. Test tube holders are usually made of metal, such as stainless steel or aluminum, and have a spring-loaded grip or clamps to securely hold the test tube.
Learn more about Test tube holder