Holding test tubes vertically so that the contents do not spill out.
Test tube racks are used to support the test tubes but unlike the test tube holder, it can store the test tubes without anyone who will hold the rack... hope this helps!
the answer is none
Test tube rack is use to hold test tube when they are not in use.
No. A ringstand is a stand with a base with a large pole sticking out of it. that you can attach rings to. A wire mesh is usually placed on the ring for setting a beaker to be heated. A test tube clamp can be attached to the ring stand to hold a test tube, for say, heating it in a hot water bath.
A test tube holder is a device to ...wait for it...hold test tubes ! ;-) Usually a rack or clamp that keeps them upright (& full if in use).
Test tube brush=use for cleaning test tubes
A test tube is used for many things. It is used to perform experiments as well as measure out certain mL of fluids. The rack itself is used for holding the test tubes if they are hot, need to stay in one place for a long time, or just so you don't have to hold the tube. Hope this helps!
When heating a test tube, you would use a test tube holder. It can also be used to hold/ support pipettes, etc. http://www.answers.com/mt/test-tube-holder
Test Tube racks are used in Chemistry to store and hold test tubes. Because test tubes have a rounded bottom they cannot stand on thereselves, therefore the rack holds and stores them.
Answerpencil and paper,Erlenmeyer flask, test tube, over flow can, test tube holders, test tube rack, Bunsen burner, tripod, safety goggles, safety gloves, safety apron, particle excel-orator, and much much more!
200m long.
It is a clamp that holds a test tube -- for instance to hold a test tube while heating it without getting burned. It is made from a thick piece of metal wire that is shaped into a spring-loaded clamp to securely hold a test tube.Note the difference between a test tube clamp, and a test tube rack. A clamp is a way to hold a single test tube while heating the contents inside without actually touching the test tube itself. A rack is instead used to hold many test tubes at once in an upright position. See the Related Questions links below for more information on test tube racks.