You answered your own question with "as the metal expands." The gap stays proportionally the same, because the whole piece of copper expands when it is heated. It isn't relevant that someone cut out a piece of it, because the copper is completely unaware of this. It expands because you heated it, causing its atoms to move apart. This expansion occurs everywhere in the copper, but obviously not in the gap (there's nothing there but air). You may be thinking something like, "Well then the copper must close the gap," but you have to remember that ALL of the copper expands. You get a bigger version of what you had before you heated it. Tight pipe and machinery fittings are accomplished using this method. Heat it to expand, cool it to shrink.
Usually I have seen the letter "a" for that purpose.Usually I have seen the letter "a" for that purpose.Usually I have seen the letter "a" for that purpose.Usually I have seen the letter "a" for that purpose.
it would be the letter b
depending on how much you put in that letter.
a sound is sounded and a letter is written
Usually the Greek letter Lambda.
4 letter word for sitcom segment
segment circle
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The letter is a capital U
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Cu=copper
Copper, bronze, alloys, nickel, silver, cobalt.
Cu is Copper!Cu - is the symbol for copper.
Not necessarily. A represents anything which you define it to be.
Explain
Please explain to me what you mean?