• A test tube with a rim, measuring 15×125 mm, is a cylindrical glass tube used for holding, mixing, and heating small quantities of substances, such as chemicals, biological samples, or other materials.

– Dimensions: 15 mm diameter x 125 mm length
– Material: Borosilicate glass or soda-lime glass
– Rim: A reinforced lip at the top of the tube for secure sealing with a stopper or cork
– Gradations: May have graduated markings for measuring volumes

• Uses:
  1. Laboratory testing: For conducting chemical reactions, heating, and mixing substances.
  2. Sample storage: For storing small quantities of biological samples, such as blood, urine, or tissue.
  3. Mixing and dilution: For preparing solutions, dilutions, and mixtures.
  4. Heating and boiling: For heating substances, boiling, or sterilizing equipment.
  5. Education and training: For teaching laboratory techniques, chemistry, and biology.
  6. Research and development: For experimentation, quality control, and analysis in various industries.

These test tubes are essential tools in laboratories, educational institutions, and research facilities, providing a safe and convenient way to handle and manipulate small quantities of substances.