why is copper a better conductor?
<answer> Because a given temperature, the conduction electrons do not get interfered with the phonons as strongly as Pb and Al (or even Fe). So it can move more efficiently. <context> So at a given temperature, the conduction electrons do not get interfered with the phonons as strongly as Pb and Al (or even Fe). So it can move more efficiently. This is also the reason why Cu is also a better electrical conductor than most other metals at room temperature.