Question

why is a boiling tube made from special glass ?​

Answer 1

$answer$

It is thicker and longer than a standard test tube, which it resembles, so that liquid doesn't boil over. The entire tube can be immersed in a Bunsen burner flame because it is composed of borosilicate glass, a type of glass which is resistant to thermal shock and will not crack when exposed to extreme heat.

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Answer 2

Answer:

Boiling tube is made of special glass because a lot of heat is produced when we boil which may tend to break the glass or damage the apparatus, so to keep ourselves safe and also not to let the apparatus break, we use that special glass.