Question

If a solid object has a hole in it, what happens to the size of the hole, when the temperature of the object increases?

Answer 1

If the object expands, the hole will expands too, because every linear dimension of an object changes in the same way when the temperature changes.
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Answer 2

Answer: Increases

Explanation:

Unless you restrict the object's expansion in particular directions, in which case the whole may shrink but the internal tensions in the object would be significant, the hole will grow.

Rocks can be broken by thermal expansion if you don't let it expand unrestricted in all directions.

The original hole diameter d will increase by the following:

d2 - d1 = ΔTα, where d2 is the diameter after heating or cooling, T is the change in temperature, and

α is the linear expansion coefficient of the material that the hole is in.

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