Question: What Is Tin Cry?
Answer: Tin cry is the sound that is made when a bar of tin metal is bent. The sound is caused by the shearing of the crystals in the metal. The tin cry actually is a relatively soft sound, sort of a crackling whine.
You can make a bar of tin cry simply by bending it. The sound will be emitted up to the point at which the metal breaks. Tin has a relatively low melting point, 232 °C, so you can melt the tin and allow it to recrystallize to repeat the process again and again.
Tin cry is a characteristic of tin, but the phenomenon is not exclusive to tin. Niobium, indium and gallium will cry when bent as the crystals shear against each other.