• A test tube with a rim, measuring 25 x 150 mm, is a cylindrical glass tube used for holding, mixing, and heating larger quantities of substances, such as chemicals, biological samples, or other materials.

– Dimensions: 25 mm diameter x 150 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
– Capacity: Approximately 50-60 ml

• Uses:
  1. Laboratory testing: For conducting chemical reactions, heating, and mixing substances.
  2. Sample storage: For storing larger quantities of biological samples, such as blood, urine, or tissue.
  3. Mixing and dilution: For preparing larger quantities of 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, such as pharmaceuticals, biotechnology, and environmental science.

These larger test tubes are ideal for applications requiring more volume, providing a safe and convenient way to handle and manipulate substances in laboratories, educational institutions, and research facilities.