Final answer:
When melted iron solidifies without a change in temperature, the iron atoms are losing potential energy, leading to the solidification process with the release of heat.
Explanation:
When melted iron solidifies without any change in temperature, the iron atoms are losing potential energy on the atomic level. Adding energy to matter gives its atoms the ability to resist some forces holding them together, with potential energy being converted to kinetic energy during phase changes.
In this scenario, as the melted iron solidifies, potential energy decreases as the atoms reorganize into a more ordered structure, releasing energy in the form of heat without a change in temperature.
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