Summary
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 edit
Structurally, jaws of a test tube holder are self-closed by a spring.[9]
Purpose edit
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]
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A metal test tube holder
See also edit
References edit
- ^ "Wiltronics - Test Tube Racks Holders & Cleaning Brushes". www.wiltronics.com.au. Retrieved 2015-11-30.
- ^ "Test Tube Holder". www.testtubeholder.org. Retrieved 2015-11-13.
- ^ "Test Tube Clamp / Holder". www.sciencecompany.com. Retrieved 2015-11-13.
- ^ Saland, Leonard (1989-01-01). Practical Chemistry Labs: A Resource Manual. Walch Publishing. ISBN 9780825115110.
- ^ "Handling and moving hot apparatus | Nuffield Foundation". www.nuffieldfoundation.org. Retrieved 2015-11-13.
- ^ Saland, Leonard (1989-01-01). Practical Chemistry Labs: A Resource Manual. Walch Publishing. ISBN 9780825115110.
- ^ "Safety in the chemistry laboratory" (PDF). Cerritos College CMS.
- ^ Interactive Science Practical Book 1A Special/ Express/ Normal (Academic). Panpac Education Pte Ltd. 2001-01-01. ISBN 9789812086082.
- ^ Ockerman, Herbert W. (1991-04-22). Illustrated Chemistry Laboratory Terminology. CRC Press. ISBN 9780849301520.
- ^ "Safety and laboratory procedures" (PDF). Central Washington University. CWU Department of Chemistry CHEM 101 Laboratory Manual. 2009.