Figure 3. Cooling of metal wires on dry ice followed by straightening. Copper wire (A) before cooling, (B) pressed against dry ice, and (C) straightening after cooling. Steel wire (D) before cooling, (E) pressed against dry ice, and (F) breaking upon straightening

From

Relation between Metal Properties and Historical Incidents: A Demonstration of Metal Burning and Cooling Experiments

Ryo Horikoshi, Takeshi Yajima, Yoji Kobayashi, Hiroshi Kageyama

World Journal of Chemical Education. 2015, 3(5), 120-123 doi:10.12691/wjce-3-5-3