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A wider tube for heating larger quantities.
Also known as: Large test tube, Heating tube laboratory
A boiling tube is drawn like a test tube but noticeably wider, made to be heated directly with a larger volume inside it.
Holds a larger quantity than a test tube and is intended for direct heating.
Contexts: Laboratory
Is distinguished from a test tube by width alone in a diagram, which is why the two are usually labelled rather than left to be told apart.
Contexts: Laboratory
A vertical rectangle wider than a test tube with a rounded lower end and an open top.