What compound expands with cold ?

[Externet]

What material presents in greater magnitude the property of shrinkage when warm -say 25 Celsius and expand when cold -say 5 Celsius ?

[Kyrisch]

Under pressure, water will freeze at a hotter temperature. Since ice is less dense that liquid water, this could possibly fit your description at >1 atm.

[Moontanman]

Water, silicon, and bismuth expand on freezing.

[Gilded]

Gallium is another good example.

[Externet]

Does anyone know about rubber behavior ?

Edited September 24, 2008 by Externet
Error

[swansont]

Rubber is another material that tends to contract upon heating. Long molecules, stretched when cold, but bent when heated.