CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Wire cutting ice, demonstrating the phenomenon of regelation, melting under pressure and freezing again when the pressure is reduced. Looping a fine wire with a heavy weight attached to it around a block of ice exerts pressure on the ice slowly and melts it locally, permitting the wire to pass through the entire block. The wire's track will refill as soon as pressure is relieved, so the ice block will remain solid even after wire passes completely through.
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