When washing dishes, the big bowl covers the small bowl. Is there any simple solution?

Just heat it, scald it with hot water or bake it over fire. Put the two bowls into the hot water. The two bowls will expand when heated. Because the diameter of the larger bowl is larger, the expansion coefficient will be smaller than that of the larger bowl when the expansion coefficient is the same. The small diameter changes greatly, so it comes off. Just like a ball bearing set assembly, when the two rings are heated, the small and large rings expand together because the material expansion coefficient is the same but the diameter is different. For example, the large ring was originally 100mm, the small ring was originally 95mm, and the gap in between was 5mm. Assume that the diameter of the large ring becomes 105mm when heated to 100 degrees, and the diameter of the small ring becomes 99.75mm, and the gap between them becomes 5.25mm. The gap in the middle is enlarged by 0.25mm, so the steel balls that could not fit in originally can be put in smoothly. When they cool down, the steel balls will get stuck in the bearing sleeve.