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 of glass or clear plastic tubing, open at the top and closed at the bottom.
Test tubes are usually placed in special- purpose racks.
Test tubes are for general chemical work and are usually made of glass, for better resistance to heat and corrosive chemicals and longer life. Tubes made from expansion-resistant glasses, mostly borosilicate glass (or fused quartz ) can withstand high temperatures, up to several hundred degrees Celsius.
Chemistry tubes are available in a multitude of lengths and widths, typically from 10 to 20 mm wide and 50 to 200 mm long. The top often features a flared lip to aid pouring out the contents.
A chemistry test tube typically has a flat bottom, a round bottom, or a conical bottom. Some test tubes are made to accept a ground glass stopper or a screw cap. They are often provided with a small ground glass or white glaze area near the top for labelling with a pencil.
Test tubes are widely used by chemists to handle chemicals, especially for qualitative experiments and assays.
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