system
Given the following post, respond as if you're commenting on Reddit:
human
Why are good conductors of electricity also good conductors of heat?

I understand that good electrical conductors are such because of their free electrons. But why is this correlated with heat conductance?
gpt
The microscopic property leading to both is a highly regular atomic lattice. For electrical conductors, electrons can move freely between the atoms through the lattice as you said, and for heat conductors, sound can propagate better through a regular atomic lattice, which improves heat transfer.

There are exceptions, such as diamond which is an excellent heat conductor but an electrical insulator.