What has a low melting point and is useful in sprinklers?

Answer 1

modern automatic sprinklers use a glass bulb that is filled with a fluid that boils and expands at a preset temperature. the glass bulb has a small bubble in the fluid. when a fire causes the fluid to boil, it shatters the glass bulb, which is keeping the waterway seal of the sprinkler in place. When the seal is gone, water can flow through the sprinkler orfice, and extinguish the fire. older sprinkler models use a link and lever arrangement, with a link of solder that melts at a preset temperature. The link and levers of the sprinkler mechanically hold the waterway seal of the sprinkler closed. When the link melts, the mechanical seal is gone, and water can flow through the orfice.

Answer 2

Probably either a lead or an antimony element or alloy would have a low enough melting points to be useful in sprinkler heads.

Answer 3

Bismuth

Answer 4

Bismuth

Answer 5

bismuth