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  1. Boiling tube - Simple English Wikipedia, the free encyclopedia

  2. Test tube - Wikipedia

  3. Boiling tube - chemeurope.com

  4. Laboratory Test Tube – Definition, Types, Uses

  5. Chemistry Laboratory Glassware Gallery - ThoughtCo

  6. A Visual Guide to Chemistry Glassware - Compound Interest

  7. Heating substances in a test tube - YouTube

  8. Boiling tube - Sciencemadness Wiki

  9. Laboratory Equipment: Test Tubes - Digitized Lab

  10. Lab Boiling Flasks & Tubes - Thomas Scientific