A test tube, also known as a culture tube or sample tube, is a common piece of laboratory glassware consisting of a finger-like length or longer of glass or clear plastic tubing, open at the top and closed at the bottom. Test tubes are usually placed in special-purpose racks.
A test tube, also known as a culture tube or sample tube, is a common piece of laboratory glassware consisting of a finger-like length or longer of glass or clear plastic tubing, open at the top and closed at the bottom. Test tubes are usually placed in special-purpose racks.
Source: Wikipedia "Test tube" · CC BY-SA 4.0
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