పరీక్ష నాళిక: కూర్పుల మధ్య తేడాలు

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పంక్తి 5:
 
Test tubes are available in a multitude of lengths and widths, typically from 10 to 20&nbsp;mm wide and 50 to 200&nbsp;mm long.<ref>[http://catalog.miniscience.com/catalog/Glassware/Test_Tube.html MiniScience.com catalog: Test Tube], accessed March 27, 2009</ref> The top often features a flared lip to aid pouring out the contents; some sources consider that the presence of a lip is what distinguishes a test tube from a culture tube.<ref>Thomas Scott (transl., 1996), ''Concise Encyclopedia: Biology''. Walter de Gruyter. ISBN 3-11-010661-2, ISBN 978-3-11-010661-9. 1287 pages.</ref> Some test tubes have a flat bottom; some are made so as to accept a [[ground glass joint|ground glass stopper]] or a [[screw cap]]. They are often provided with a small [[ground glass]] or white [[glaze (pottery)|glaze]] area near the top for labeling with a pencil.
 
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