Assertion: gray tin | /r/AtLocation | temperature
Facets:
value: below 13.2 °c
type: OTHER
Source sentences:
text: White tin may also refer specifically to β-tin, the metallic allotrope of the pure element, as opposed to the nonmetallic allotrope α-tin, known as "gray tin", which occurs at temperatures below 13.2 °C (55.8 °F) (see Tin pest).