heating sheet
What happens if you cut a hole in a metal sheet then heat it?
We know that metal expands when heated, so what will happen if you cut a hole the size of a quarter in the center of a baking tray, then pop it in the oven until very hot? Quarter will be adjusted in the hole? Is the hole to be bigger or smaller, and why? Thanks!
Any way that was extended uniformly expanded from uniformly everywhere! That means that even the holes themselves "expand", or become larger, not smaller. This is why the operators often use a blowtorch to heat a steel block to release a pin, bolt or screw that may be stuck in it. To understand why this should be so, I imagine they have a complicated way of cutting a piece of paper. I that intersect in many small squares. Now, I use a copy machine to produce a larger version thereof. The form is exactly the same but a larger version of it. All the little squares are still in perfect squares, but only a slightly larger. That's what happens when matter is heated and becomes larger. Each small square is not paying attention to the rest of the places around them, all of them only grow in size in the same way.
Marc Terenzi - Heat Between The Sheets
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