Recalescence of iron
The solid Fer undergoes a Transition from phase, called recalescence , when it is heated above 906 °C. Its crystalline Structure changes, which involves a variation of its Density.
Description
The recalescence of iron can be observed simply by connecting a Power supply of some amp S on a cord of piano tended. The heating produces makes pass iron to the red, the cord of piano thus lengthens a little. By extinguishing the food, the cord cools and thus is retightened. But during a short moment, one sees it slackening again, which corresponds to the moment when it changes crystalline structure.
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