Soldering Techniques?

[MountainMan]

Both temperature and humidity cause expansion, depending on the materials. Next time you drive over a bridge or on a concrete surface, notice the number and placement of the expansion joints. Concrete and steel are unaffected by humidity, but respond to temperature variances. You will also see expansion joints in brick buildings, as well.

I'm surprised that one of our more technically advanced members hasn't figured out a way to measure the expansion in his layout using altered conductivity or something.