2007-01-03 11:05:48 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Physics
the hole size decreases because the molecules expand when heated, closing up the space where the hole was.
2007-01-03 11:07:24 · answer #1 · answered by peaceloveliberals 2 · 2⤊ 5⤋
It could do either, depending on how much of the metal is heated.
If the entire sheet of metal is heated, the hole diameter will increase according to the coefficient of thermal expansion.
If only the immediate region around the hole is heated, the outer portion of the metal will constrain the expansion, so the metal will be stressed and expand in the directions of least resistance, making the hole diameter slightly smaller.
2007-01-04 03:03:31 · answer #2 · answered by or_try_this 3 · 0⤊ 0⤋
Some confusion I see. For a material that expands when heated, as most metals do, the hole will decrease. Why? Its very simple, just think of it as a ball first. Obviously when its heated the ball will get bigger. So the 'outer' surface expands outward. Now squish the ball down to a sheet and form a hole, see that the inside of the hole is still the 'outer' surface? So when the material expands, the 'outer' surface inside the hole expands in the 'inward' direction.
Of course this is a trick, because the expansion actually increases a relative fixed diameter of any circle drawn on your metal plate, whether there is a hole or not. For the circle to decrease, the interior expansion 'inward' would need to overcome the circumferential expansion, which could probably be done somehow...
2007-01-03 19:30:50 · answer #3 · answered by Karman V 3 · 0⤊ 2⤋
I think you will find the hole size increases
You might think the metal will expand and fill the hole
but i believe that because the molecules of the metal around the hole expand and become bigger the hole does actually increase
It is no different to a ring which when heated gets bigger, the size of the hole in the ring increases
Being a sheet of steel does not change the result
simple way to see for yourselves
draw a ring of circles (molecules) say ten on a piece of paper
then redraw a ring of circles but this time with the circles (molecules) twice the size
the hole in the middle of the circles increases in size
2007-01-03 19:26:09 · answer #4 · answered by benji 3 · 4⤊ 0⤋
It increases. It is a reason why mechanics use a blow torch to unfreeze a stuck bolt. They heat the outside of the hole to expand it. Since the bolt might be harder metal it won't expand as fast.
The hole expands.
2007-01-03 19:57:22 · answer #5 · answered by aorton27 3 · 0⤊ 0⤋
Increases, because the whole sheet of metal expands in all three dimensions.
2007-01-03 19:24:25 · answer #6 · answered by Anonymous · 5⤊ 0⤋
Decreases.
2007-01-03 19:08:13 · answer #7 · answered by Anonymous · 0⤊ 3⤋
it deacreses because the metal expands when it's heated
2007-01-03 19:09:13 · answer #8 · answered by Anonymous · 0⤊ 2⤋
Increases.It expands.
EDIT:I see im getting thumbs down.To bad I know im right for a fact!
2007-01-03 19:07:26 · answer #9 · answered by jill@doodle 5 · 4⤊ 4⤋
decreases
2007-01-03 19:07:58 · answer #10 · answered by ? 7 · 1⤊ 3⤋