Question

What happens if iron rod is is gradually heated to the molecules of iron?

Answer 1

I would become a liwuid

Answer 2

When we heat an iron rod, some amount of heat energy that was absorbed by iron rod is emitted as light. First iron turns into red (lower energy corresponding to higher wavelength) and as the temperature rises it glows and turns into orange, yellow, blue respectively (higher energy and lower wavelength). If we go on heating the rod it turns into white light which includes all visible wavelengths.