Give resons why Ordinary test tubes cannot be used for heating.
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They are designed to be wide enough to allow substances to boil violently as opposed to a test tube, which is too narrow; a boiling liquid can explode out of the end of test tubes when they are heated, as there is no room for bubbles of gas to escape independently of the surrounding liquid.
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Test tubes are one of the few types of glassware intended to be heated via direct flame. This is partly due to their shape and their small size. However, it is still possible to shatter them with incautious heating. Do not put the test tube directly into the flame.
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