Excessive heating and cooling of a glass pipe with a hairline fracture can cause an explosion. Meth pipes, crack pipes, bongs that aren't made of heavy, thick glass have the potential to explode.
The physics say, glass will expand when heat is applied to it. Which is true, molten glass is subjected to heat and then blown into a sphere to create a glass pipe.
Physics also say that two objects of different temperatures will attempt to find a common temp when they are brought together; like an egg heating up in a frying pan.
A pipe with a hairline fracture in the bowl of the pipe, heated with say, a lighter, becomes hot. Setting the pipe on any surface not equally as hot, quickly cools the pipe, forcing the glass to withstand an enormous amount of pressure.
The hairline fracture isn't a hairline fracture anymore.
I'ts exploded.
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