1) Laboratory glassware
Found on
https://www.crosswordclues.com/clue/boiling-tube
A boiling tube is a small cylindrical vessel used to strongly heat substances in the flame of a Bunsen burner. A boiling tube is essentially a scaled-up test tube, being about 50% larger. They are designed to be wide enough to allow substances to boil violently as opposed to a test tube, which is too narrow; a boiling liquid can explode out of the...
Found on
http://en.wikipedia.org/wiki/Boiling_tube
No exact match found.
