Wire melts through block of ice

Weights hang on a metal wire on a block of ice. The wire will melt through the block of ice over time. This experiment can also be performed with a nylon thread, which does not melt through the block of ice. Thus it can be shown that it is not the pressure that melts the ice. In fact it is the thermal conductivity of the metal wire that is responsible for the wire melting through the block of ice.