Engineering:Test tube holder
A test tube holder is used to hold test tubes.[1] It is used for holding a test tube in place[2] when the tube is hot or should not be touched.[3] For example, a test tube holder can be used to hold a test tube while it is being heated.[4] Moreover, when heating the tube with liquid or solid contained inside, the holder ought to tightly hold a test tube[5] in order for the tube to be safely held while heating.[6]
Particularly, for liquid heating, when holding a test tube holder with a test tube, hold it such that it aligns with the lab bench and also point the open end of the tube away from yourself or anyone nearby.[7]
Additionally, while using a test tube holder, the proper distance between the test tube holder and the top of the test tube is approximately 3 centimetres.[8]
Structure
Structurally, jaws of a test tube holder are self-closed by a spring.[9]
Purpose
The purpose of a test tube holder is to be used only to hold a test tube as it is not structured for flasks or other heavier objects. It also is used when wanting to burn something small that cannot be held using your hand.[10]
A metal test tube holder
See also
References
- ↑ "Wiltronics - Test Tube Racks Holders & Cleaning Brushes". http://www.wiltronics.com.au/catalogue/120141/science/test-tubes-and-centrifuge-tubes/test-tube-racks-holders-and-cleaning-brushes.
- ↑ "Test Tube Holder". http://www.testtubeholder.org.
- ↑ "Test Tube Clamp / Holder". http://www.sciencecompany.com/Test-Tube-Clamp-Holder-P6285.aspx.
- ↑ Saland, Leonard (1989-01-01). Practical Chemistry Labs: A Resource Manual. Walch Publishing. ISBN 9780825115110. https://books.google.com/books?id=RAIDpod25X4C.
- ↑ "Handling and moving hot apparatus | Nuffield Foundation". http://www.nuffieldfoundation.org/practical-chemistry/handling-and-moving-hot-apparatus.
- ↑ Saland, Leonard (1989-01-01). Practical Chemistry Labs: A Resource Manual. Walch Publishing. ISBN 9780825115110. https://books.google.com/books?id=RAIDpod25X4C.
- ↑ "Safety in the chemistry laboratory". http://cms.cerritos.edu/uploads/Chemistry/Safety/Zewail_Safety_in_the_Chem_Lab090810.pdf.
- ↑ Interactive Science Practical Book 1A Special/ Express/ Normal (Academic). Panpac Education Pte Ltd. 2001-01-01. ISBN 9789812086082. https://books.google.com/books?id=uOZTznssVGMC.
- ↑ Ockerman, Herbert W. (1991-04-22). Illustrated Chemistry Laboratory Terminology. CRC Press. ISBN 9780849301520. https://books.google.com/books?id=3x5pi9Hw228C.
- ↑ "Safety and laboratory procedures". CWU Department of Chemistry CHEM 101 Laboratory Manual. 2009. http://www.cwu.edu/~petersj/chem101sp09/safety.pdf.
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