in reply to burgermeister
a longer copper rod is less conductive than a shorter copper rod, because thermal resistance grows with the length that the heat has to travel. so adding copper pieces to the material adds no heat transfer abilities, it just makes the pathlength longer that heat has to travel, so it travels less well and has actually higher thermal resistance in total.
in reply to blargh513

They're all real copper on the outside. Even the fake ones are copper plated. So the surface you're pissing on is copper regardless and would show the same reactions.

If you want a simple way to find pure-copper pennies, you don't need piss -- just look at the dates on them. Dates before 1982 will be pure copper (with a few rare exceptions), and after 1982 are all copper-plated zinc (with one rare exception).

Esta entrada fue editada (hoy, 3:30)
in reply to Imgonnatrythis
Copper pans exist but they can be a pain to cook with. The high thermal conductivity means they heat up much faster than you expect, so it's easier to accidentally burn stuff, and they also cool down much more quickly once off the heat which can also be annoying. Plus you need to worry about oxide formation and food sticking much more than you do with steel pans.
Esta entrada fue editada (hoy, 7:09)