Let us consider a copper wire of mass 1kg and length 1m. Let the temperature & cross-sectional area be constant.

Case 1:

If I cut the wire with a scissor, and make it shorter from 1m to 0.8m, then the resistance of that 0.8m wire would be the same as that of the 1m copper wire.

Case 2:

If I melt the 1m & 1kg copper wire and make a 1kg copper wire of length 0.8m, then the resistance of the newly formed copper wire would decrease.

Is my understanding correct?

Let us consider a copper wire of mass $1\ \mathrm{kg}$ and length $1\ \mathrm{m}$. Let the temperature & cross-sectional area be constant.

Case 1  :

If I cut the wire with a scissor, and make it shorter from 1m to $0.8\ \mathrm{m}$, then the resistance of that $0.8\ \mathrm{m}$ wire would be the same as that of the $1\ \mathrm{m}$ copper wire.

Case 2  :

If I melt the $1\ \mathrm{m}$ & $1 \ \mathrm{kg}$ copper wire and make a $1 \ \mathrm{kg}$ copper wire of length $0.8\ \mathrm{m}$, then the resistance of the newly formed copper wire would decrease.

Is my understanding correct?