It was then discovered the resistance drops to 0 after the critical temperature. It is explained by BCS theory, how two electrons goes from fermions and bonds into a boson.
This theory can be used to leviates trains or everything. Explained by the meissner effect. This video only cover type 1 and not type 2 superconductors.
0:00 – Introduction
1:19 – What is conduction
2:00 – Temperature and resistance
6:52 – Meissner effect and applications