Timeline for Will a hole cut into a metal disk expand or shrink when the disc is heated?
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| when toggle format | what | by | license | comment | |
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| Aug 3, 2017 at 15:37 | comment | added | Žarko Tomičić | So lets make it shor and sweet...all of the molecules in a heated disc must now be vibrating more and therefore they occupy more space. That is true for all the molecules and even for ones that are on the edge of the hole in the middle. So if hole gets smaller molecules get closer...and this is not possible...SO the hole has to get bigger. | |
| Oct 6, 2014 at 18:23 | review | Suggested edits | |||
| Oct 6, 2014 at 18:25 | |||||
| Apr 15, 2012 at 21:54 | comment | added | celtschk | @Mallik: But it would also try to expand along the ring, and if it moves inward, it has even less space. Therefore it has to move outwards in order to expand (with the outer parts moving outwards more). | |
| Mar 15, 2012 at 18:27 | history | edited | David Z | CC BY-SA 3.0 |
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| Mar 15, 2012 at 17:50 | comment | added | Mallik | Consider the disc made of isotropic material is heated uniformly across its area... the metal near the outer circumference, tries to expand outward because of resistance from its disk-side neighboring molecules. Similarly, the part that is near the inner circumference of the hole (cut-out part) tend to expand to its free side, and thereby covering up the hole | |
| Jul 22, 2011 at 13:51 | comment | added | Kevin Reid | Wikipedia on materials with negative thermal expansion. | |
| Jul 22, 2011 at 6:22 | history | answered | David Z | CC BY-SA 3.0 |