Tin bent, a crackling sound known as the "tin cry" can be heard from the twinning of the crystals. Tin melts at low temperatures of about , the lowest in group 14. The melting point is further lowered to for 11 nm particles. β-tin (the metallic form, or white tin, BCT structure), which is stable at and above room temperature, is malleable. In contrast, α-tin (nonmetallic form, or gray tin), which is stable below , is brittle. α-tin has a diamond cubic crystal structure, similar to diamond, silicon or germanium. α-tin has no metallic properties at all because its atoms form
Tin-Tin Kyrano that stereotypes are common but "handled with some sensitivity – all except for Tin-Tin, a literal China doll". Kate Hunt of the University of Glasgow, author of a study of the series' presentation of tobacco smoking, observes that in marked contrast with prolific smokers such as Penelope, Tin-Tin is "incongruously" and "inconsistently" seen with a cigarette in only one episode ("The End of the Road"). She writes that the character occupies a socially-ambiguous position within her home environment, appearing variously as "adopted daughter, secretary, and occasional member of the International Rescue team". In the 2004 live-action film, "Thunderbirds", in which