What is the purpose of a test tube rack?
Test tube racks are laboratory equipment used to hold upright multiple test tubes at the same time. They are most commonly used when various different solutions are needed to work with simultaneously, for safety reasons, for safe storage of test tubes, and to ease the transport of multiple tubes.
What are test tubes held in?
Test tubes are usually held in special-purpose racks, clamps, or tongs. Some racks for culture tubes are designed to hold the tubes in a nearly horizontal position, so as to maximize the surface of the culture medium inside.
Who invented test tube holder?
Michael Faraday
Two renowned chemists, Jons Jacob Berzelius (1779–1848) and Michael Faraday (1791–1867), have been suggested as the inventor of the test tube.
What is the proper use of test tube?
A test tube is a clear glass or plastic container that is much longer than it is wide, commonly has a U-shaped bottom, and has an open top. Test tubes are used to hold, mix, and heat chemical experiments. They are used as homes for microorganisms when people want to culture (grow) them.
When would you use a test tube holder?
A test tube holder is used to hold test tubes. It is used for holding a test tube in place when the tube is hot or should not be touched. For example, a test tube holder can be used to hold a test tube while it is being heated.
How do you hold a test tube while heating?
Hold the test tube at an angle. Point the test tube away from yourself and all other people. Heat the test tube gently from the top of the substance being heated, and always wear safety googles.
How many types of test tube are there?
There are several material types of test tubes: glass, plastic, metal and ceramic. Glass and plastic are the most common while metal and ceramic are less common. There are several sub-types of glass and plastic test tubes.
Why should you never use a test tube holder to carry a flask?
Test tube holders should be used for test tubes only, because they are too weak to carry flasks or other heavier objects. Your instructor will discuss the toxicity and other dangerous properties of any materials for which special precautions are necessary.
Where should heat be applied to a test tube?
Try to heat the area near the liquid surface slightly more than the bottom of the tube. This concentrates boiling near the surface of the liquid and reduces the potential for bumping and boil-over.
What do you call a lab tube rack?
Selecting a Tube Rack on Amazon.com. A tube rack, also called a test tube rack or test tube holder, is a piece of laboratory equipment used to hold, store, and support lab tubes so that they do not roll away, tip over, break, or strike one another. The racks also help protect lab benches and refrigerators from spills and stains.
How big is a Thermo Scientific test tube rack?
Rely on Thermo Scientific plastic test tube racks to provide reliable support and organization for your lab’s test tubes, centrifuge tubes, conicals, and other tubes in the 13–30mm diameter range.
How big is a centrifuge test tube rack?
Securely hold a full load of test tubes or centrifuge tubes for 13, 16, 20, 25 and 30mm diameter sizes with these strong, durable racks. Chemically-resistant and durable for transport or sample handling.
How many test tubes does a locking rack hold?
Test tube locking rack (holds 50 tubes). The Fisherbrand Locking Test Tube Rack has silicon gripping feature securely holds tubes in place. Please log in to view your contract price information for any cross-referenced items.