Jiaozi is one of the traditional delicacies in China, and it contains a lot of physical knowledge in the process of wrapping, cooking and eating: (1) When wrapping jiaozi, roll the dough into skin to

Jiaozi is one of the traditional delicacies in China, and it contains a lot of physical knowledge in the process of wrapping, cooking and eating: (1) When wrapping jiaozi, roll the dough into skin to show its strength. The shape of (1) surface changes under the action of force, which shows that force can deform the object.

(2) When the light reflected by the jiaozi is obliquely incident from water (such as air), it is refracted, and the refracted light is deflected to the water surface. When we look against the refracted light, we see that the intersection in the water is shallower than the actual position;

(3) The molecules that make up the jiaozi keep moving irregularly. By diffusion, molecules fill the whole space, so people around them can smell the fragrance.

So the answer is: (1) shape; (2) refraction; (3) diffusion.