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When a block with a hole is heated why does not the material around the hole expand into the hole and make it small?
Wiki User
∙ 9y ago
Why would it? Imagine that every atom of the substance gets a little larger. Wouldn't the atoms in the wall of the hole get bigger too? Then the hole would get bigger, not smaller. Thats Wrong (I think). If the metal atoms around the hole get bigger then the hole should get smaller. And the gas atoms in the hole will be pushed out. Plankey1995 JF
Wiki User
∙ 15y ago
Wiki User
∙ 9y agoHoles expand when heated. Look at the geometry of the same, pre-perforated, block with a circle drawn on it. The radius of the circle expands as the block is heated. The same reason for the expansion of the circle is the reason for the expansion of the hole.
Simplify things: set three blocks in a triangular pattern. heat them. Each block expands linearly and the triangle formed by the blocks increases in volume. A circle is a polygon with an infinite number of sides. as each of those sides increases linearly, the radius of the circle increases.
Wiki User
∙ 6y agoIt does to a small amount but this effect is dwarfed by the cumulative expansion pressure round the circumference of the hole, the forces of which will make the hole larger.
Imagine a steel bar 20 feet long and 1 inch in cross section when cool.
When you heat this bar up to a high temperature, it will grow enormously in length and very slightly in cross sectional area. Most of the expansion will be along the length.
Now bend the bar roud into a circle and weld it closed.
Again when you heat it up the (now circular) length will increase making the circle bigger and this effect will be bigger than the cross section expansion.
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When a block with a hole in it is warmed why doesn't the material around the hole expand into the hole and make it smaller?
If the block expands linearly, all of its dimensions will expand in proportion, including the dimensions of the hole. Expansion is more like stretching, it's not "growing" like extra material being added to the exposed surfaces. Think of it this way, when the material expands the molecular bonds are lengthened. For an analogy imagine a group of people standing in a tight circle with elbows linked. Then they lengthen their "links" by moving to hold hands at arms length. As they all stand further apart they also have to expand the circle by standing back. This is like the molecular bonds around the hole. Another way of thinking of this is to picture the block without a physical hole, just a circle drawn on it to represent the hole. When the block expands, the circle expands in proportion. If the hole had been there it would have expanded in exactly the same way as the circle, because the absence of material would not cause migration of material. This is why it helps to heat a nut that won't budge off a bolt.
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When a block with a hole in it is warmed why doesn't the material around the hole expand into the hole and make it smaller?
If the block expands linearly, all of its dimensions will expand in proportion, including the dimensions of the hole. Expansion is more like stretching, it's not "growing" like extra material being added to the exposed surfaces. Think of it this way, when the material expands the molecular bonds are lengthened. For an analogy imagine a group of people standing in a tight circle with elbows linked. Then they lengthen their "links" by moving to hold hands at arms length. As they all stand further apart they also have to expand the circle by standing back. This is like the molecular bonds around the hole. Another way of thinking of this is to picture the block without a physical hole, just a circle drawn on it to represent the hole. When the block expands, the circle expands in proportion. If the hole had been there it would have expanded in exactly the same way as the circle, because the absence of material would not cause migration of material. This is why it helps to heat a nut that won't budge off a bolt.
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