Assertion: tin's form | /r/HasProperty | gray
Facets:
value: below 18°c
type: OTHER
Source sentences:
text: When tin is cooled below 13.2°C, it slowly changes from the white form to the gray form, although the transition is affected by impurities such as zinc or aluminum and can be prevented if small amounts of bismuth or antimony are present.
text: Pure crystalline tin exists in two allotropic modifications, the metallic form (white tin), and a semimetallic form (grey tin).
text: The first form of tin is called gray tin and is stable at temperatures below 13.2°C (55.76°F).
text: Tin comes in a white or gray form depending on the temperature.
text: Below 18°C, the stable form is α-tin, or grey tin, with a diamond structure (like carbon, silicon and germanium) and a density of 5.765 g/cc.