Question

when a metallic Block with hole in it is heated why does not the material around the hole expand into the wall and make it smaller​

Answer 1

Explanation:

this is better explained by the fact that you imagine that the hole is covered and now heat and then and then you will know the the hole has to expand.

when you will go on a molecular level you will see that every molecule is at a certain distance vibrating about their mean position and when you will hear the amplitude of vibrations increases thus the distance between every molecule has to increase