Why does metal glow when heated?

Answer 1

Is that really your question? Do you mean in the experiment when iron and sulfur are mixed and heated why does it glow red? During the experiment iron and sulfur begin to react at higher temperatures. As they react there is a release of energy, some of which is heat and some is in the red light region. During the reaction iron sulfide is produced.

More simplistically, heating many things caused them to glow red. Heating iron can cause the iron alone to start giving off a red glow because while absorbing the heat the electrons in the atoms move to a higher energy level. Some of that absorbeb energy is released as the electrons move back to lower energy levels releasing some energy as red light waves.

Answer 2

The hot steel glows because the atoms in the steel are vibrating with a lot of energy. If the steel is warm, you don't see a glow. The atoms vibrate, but not enough to emit light that we can see. If the steel gets hot, it glows red. As the steel gets hotter and hotter, the atoms get a lot of energy, but not all with the same amount. Some have more energy, some have less. So you get a whole range of colors together, and the glowing steel appears white.

Answer 3

steel like all metals convey heat energy through conduction ware the energies forces the molecules of the metal to move rapidly causing friction internally and also softening of the metal aswell as alowing the energie to be transferred kinetically down the line this also is shown well by taking a thin bar of metal and flexing it back and forth repetitively then after 20-30 folds have a feel and you should notice an active show of friction at a molecular level

Answer 4

1. At red heat (~770C) it loses all its magnetic properties (Curie point).
2. At white heat (~1300C) it melts (Melting point).
3. When very very hot (~3000C) it evaporates (Vapor/Boiling point).

Note that all these temperatures vary widely depending on the exact steel alloy involved.