Well when you are doing scientific experiments with test tubes you may put different substances or whatever you're using in different tubes therefore to separate them and study them individually...
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To hold test tubes. LOL
A test tube (or sample tube) has no errors.
A test tube can be held upright using a test tube rack, a test tube holder, or a clamp attached to a stand. These tools provide stability and prevent the test tube from tipping over during experiments.
The alternative name for the germ tube test is "Reynold's test."
According to the American Heritage Dictionary of the English Language, a test tube is a "clear, cylindrical glass tube usually open at one end and rounded at the other, used in laboratory experimentation."A test tube can be used to store chemicals that are dangerous to skin,or be connected to other lab equipment for experiments. In this case, it is usually to collect a useful product.