Why Are Glass Cups Easy to Burst in Winter
Generally, if pouring boiling water into a glass cup, cups with a thicker wall are more likely to burst.
Since the glass cup is cold, and when hot water is poured, the inner wall will expand rapidly due to thermal expansion and contraction; however, because the glass is a poor conductor of heat. If the wall of the cup is thick, the temperature will not be transmitted to the outer wall quickly, so that the inner wall expands. But the outer wall remains in its original state, so it will lead to cup’s explosion and breakage.
In the same way, glass cups are more likely to burst in winter because of the large difference in the temperature between inside and outside.
The thinner the cup, the faster the heat conduct when hot water is poured. With small temperature difference between the inner and outer walls, the glass cup is not easy to break.
If you slowly pour boiling water in a small amount and shake the cup simultaneously, you can avoid glass burst because the inside and outside of the cup are evenly heated.