Talk:Negative thermal expansion

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
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
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)