Number of electrons per cubic metre

[Forest1239879]

If you stretch a wire, increasing its length will the number of electrons per cubic metre decrease? Assuming the Cross sectional area stays the same. The number of electrons will surely stay the same, and won't increase just by you stretching it, and the number of cubic metres has increased, so n (electrons per cubic metre) will decrease?

 

[mgb_phys]

If you stretch it without changing the diameter then you must be decreasing the density.
So the amount of metal and so the amount of electrons in a cc in the middle must decrease.

 

[astrokreng]

The number of electrons per cubic metre is a measure of electron density, which is a property of the material and does not change with the length of the wire. Therefore, if the cross sectional area remains constant, the number of electrons per cubic metre will also remain constant regardless of the length of the wire. This is because the number of electrons in a material is determined by its atomic and molecular structure, not by its physical dimensions. Therefore, stretching the wire will not change the number of electrons per cubic metre, but it will decrease the electron density in the stretched portion of the wire due to the increased volume.