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A narrow tube closed with a rounded end.
Also known as: Culture tube, Sample tube laboratory
A test tube is drawn as a narrow tube with a rounded closed end, used for small-scale reactions and observations.
Holds a small quantity for reaction or observation.
Contexts: Laboratory
Is round-bottomed so it withstands heating, which is why a flat-bottomed tube of the same size is a different item with a different use.
Contexts: Laboratory
A narrow vertical rectangle with a rounded lower end and an open top, sometimes with a small rim.