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The outdoor temperature was below the freezing point and I did verify that
my copper wire (supporting two 4.5 kg weights, as described before) does
not penetrate ice at low temperatures (between -2 and -5 C). It has been
supported by the block of ice for more than 24 hours. The meaning is clear;
melting of ice under a loaded wire, often demonstrated at room temperatures,
is not caused by pressure; it is caused by heat traveling along the wire.
PLEASE DO NOT SAY "SO WHAT". A common textbook misconception is a great
teaching resource. Help your students discover that "this book statement is
wrong" and they will feel great about studying physics.