Tin pest related problems such as tin whiskers. At 13.2 °C (about 56 °F) and below, pure tin transforms from the silvery, ductile metallic allotrope of β-form "white tin" to the brittle, nonmetallic, α-form "grey tin" with a diamond cubic structure. The transformation is slow to initiate due to a high activation energy but the presence of germanium (or crystal structures of similar form and size) or very low temperatures of roughly −30 °C aids the initiation. There is also a large volume increase of about 27% associated with the phase change to the nonmetallic low temperature allotrope. This frequently makes tin
Wedding Typically, this ceremony is held to commemorate a milestone wedding anniversary. It may also be held to recreate the marriage ceremony in the presence of family and friends, especially in the case of an earlier elopement. A same-sex wedding is a ceremony in which two people of the same sex are married. This event may be legally documented as a marriage or another legally recognized partnership such as a civil union. Where such partnerships are not legally recognized, the wedding may be a religious or symbolic ceremony designed to provide an opportunity to make the same public declarations and celebration