Will a hole cut into a metal disk expand or shrink when the disc is heated?
The metal disc of diameter D1 has a hole in it and the diameter of the hole is D2 (D2
Now, if I heat the metal disc, it expands. As far as I know, the metal expands along its free ends upon heating. In this case, the disc has got the scope to expand along both the inner and outer circumferences of the disc.
The question here is, in which way does the metal disc really expand and as a result, will the hole on the disc expand or contract. To put in other words, assuming the new diameter of the hole on the disc to be D3, will D3 be greater than, lesser than or equal to D2?