"Tubes"

In chemistry, "tubes" typically refer to test tubes—small cylindrical containers made of glass or plastic used to hold, mix, and heat small amounts of liquids or chemicals during experiments. They are essential tools in laboratories for conducting reactions, observing changes, and performing tests. Test tubes come in various sizes and can be heated directly or used with other equipment like racks and stands. Their simple, standardized design makes them versatile and easy to handle, facilitating safety and efficiency in scientific procedures.