When metal conducts heat , that metal expands.
Conduction is the passing of heat through a medium.
Metals expand when they don't pass all of the heat through themselves to elsewhere.
What is the result of imperfect passing of heat through a metal, on that metal?

A) contamination
B) expansion
C) sweating
D) Energy.
E) forces
F) burning
G) Evaporation
H) electricity