Talk:Negative thermal expansion
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Ice does not have negative expansivity. Transition from liquid water to water ice shows increase of volume, but as phase transition I do not think it qualifies. Water from 0 to 3.983 C does however increase in density as function of temperature.
- Actually, ice does show NTE in its hexagonal and cubic phases at very low temperatures (below -200 °C). Spute 20:41, 2 February 2007 (UTC)
rubber
[edit]Would a rubber band be an example of an object with NTE at commonly experienced temperatures? It shrinks when you heat it up with a heat gun. 4.242.147.224 (talk) 02:29, 22 June 2009 (UTC)
- Rubber is the classic example of an NTE material. Another interesting corollary of this is that if you stretch it, it heats up, and when it relaxes it cools down - try stretching a rubber band held against your top lip. Stub Mandrel (talk) 20:20, 19 November 2013 (UTC)
Invar
[edit]Although some variants of invar show NTE, it is NOT a composite material (it is an alloy). I have therefore deleted it as an example of an NTE composite. Stub Mandrel (talk) 20:20, 19 November 2013 (UTC)