copper bends because it's malleable.
No and that's final >:- ()
If you are asking why DOES copper bend on heating, then i can answer that. When heat is applied, the copper molecules are spread farther apart, making the molecular structure weaker, thus you may...
Depends if the copper tubing is annealed or drawn type as not all copper tubing if bendable
that would depend on the temper of the tubing as some types cannot be bent