An ordinary glass bottle cracks when boiling water is poured into it, but a borosil glass bottle does not.
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Solution
An ordinary glass bottle cracks when we pour boiling water into it because there is a lot of temperature difference between the inner and outer parts of the glass.
The inner part gets hot and expands while the outer part remains cold since glass is a bad conductor of heat.
This unequal expansion causes the crack of glass bottle.
But the borosil glass bottle has a very high melting point so the temperature difference is very less, hence it doesn’t crack.