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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?
Wiki User
∙ 14y ago
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.
Wiki User
∙ 14y ago
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Why is invar so often used to make acurate thecnical instrements that are used in hot situations?
invar steel is an alloy of steel and nickel . it doesnt expand like any other material at high temperatures .therefore it is used to measure accurately
When liquid is cooled does the particles get smaller?
As a rule of thumb atoms tend to Contract(less space in between each atom) and expand with heat( more space in between each atom). ice if i rember correctly is the only material that does expand when frozen though.
What happens to matter when it expands?
In general, intermolecular bonds are "stretched" by the energy of faster moving molecules. This makes the material larger when heated. Similarly, decreasing external pressure will allow the bonds artifically compressed to expand. Other than that, if your stretch a material in one axis mechanically (Hooke's law), it gets smaller / thinner off axis. As if the material's volume were a constant (up to a point).
Do gases keep the same volume?
Usually not. They can easily expand into a larger volume, or be compressed into a smaller volume.
Do all solids expand and contract by the same amount?
No. The rate of expansion/ contraction varies from one material to the next.
Do rivers expand or get smaller because of erosion?
Expand
What material allows concrete sections to expand on bridges?
Material such as wood allow the concrete to expand
A material may what when it is heated?
expand
Does steel expand when heated?
Yes. Pretty much every material expands when it gets hotter. Steels expand moderately, around 10-15 parts per million per degree Celsius.
How did did Ghana expand its kingdom?
Ghana expanded its kingdom by offering protection to the smaller tribes then he would control there tribe and expand there kingdom.
What happens to the volume of a material when it is heated?
It depends on the material. Most materials would expand and the volume would increases.
What is expansion and contraction in materials?
Temperature of a material is a measure of the motion of the molecules in it. The more the molecules jitter around and collide randomly, the higher the temperature, and vice versa. More motion of the molecules makes the material expand a bit, less motion makes it contract (get smaller). The amount of such expansion/contraction depends on the material -- the shape and weight of the molecules, the bonds they might form between them, and the way they fit together. In very unusual cases (like some rubbers), heat might actually make the materials contract instead of expanding. So it's important to know exactly what your material is made of and study how much it will expand and contract at various temperatures, if you plan to build with it!
Why doesnt the abyss freeze?
there is to much preasure down there. ice has to have a way to expand when it frezes. if there is too much water on top of it, it cant expand because of all of the weight.
Why is invar so often used to make acurate thecnical instrements that are used in hot situations?
invar steel is an alloy of steel and nickel . it doesnt expand like any other material at high temperatures .therefore it is used to measure accurately
Two examples of thermal expansion?
Just about any material will expand if heated.
Are all material will expand when heated Have any exception?
Rubber contracts when heated.
When liquid is cooled does the particles get smaller?
As a rule of thumb atoms tend to Contract(less space in between each atom) and expand with heat( more space in between each atom). ice if i rember correctly is the only material that does expand when frozen though.
