If I take a circuit, for instance an RC circuit, on a PCB while attached to some AC source or network analyzer and measure the voltage drop across one of the components, when I melt one of the connections, e.g., with a soldering iron (but with the component(s) still in place and in mechanical contact with the corresponding track(s)!), will then the circuit stop working?
I haven't tried it yet just in case something goes terribly wrong.
From a theoretical perspective, the junction I melt is then not in solid state, which means that all the quantum treatment of the valence-conduction bands is no longer valid. On the other hand, tap water, which is liquid, is a good conductor, so I don't know if electrons will be free to flow or not at all in the circuit through the melted junction.