Posted by elliott on Saturday, October 16, 2010 at 11:28am.
20 cm is not a volume. Either you mean 20 cubic cm or that the length returns to 20 cm.
Almost all materials get let dense when the temperature is increased. The reason is that the atoms or molecules start "jiggling around" more as they absorb heat energy, and they tend to push neighboring molecules farther away.
The only exceptions I know of are water between 0 and 4 degrees C (which gets denser when heated), and certain types of low-expansion glass (Zerodur; ULE). Glasses can have quite anomalous behavior.
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