The main reason why the glass cup is easy to burst is: when the cup suddenly comes into contact with hot water, because the glass has a low thermal conductivity and a slow heat conduction speed, the temperature of the inner wall cannot be transferred to the outside of the wall all at once. The volume will suddenly expand, and the volume of the outer wall will not have time to expand, so the cup will burst. When using a microwave oven to heat liquid in a glass, because the liquid inside is gradually heated, the temperature of the liquid on the inner wall has sufficient time to be transferred to the outside of the wall. Therefore, the volumes of the inner and outer walls will basically expand at the same time, and there will be no The glass on the outer wall bursts. Therefore, glass cups can be used to heat food in a microwave oven without exploding. But you must not heat the food with the lid on, because when the temperature of the food rises, the food will expand or the temperature will rise, gas will be produced, and the pressure in the glass will rise, which will definitely cause an explosion (any other Do not put the lid on the container when heating it in the microwave).