We can heat a piece of metal to red hot and to white hot. Can we heat it until the metal glows blue hot?

Question

if so please explain.

Answer 1

Not really. To reach "blue hot" you need to shift the peak of the (black-body) emission spectrum into the blue wavelength region, which requires a temperature something on the order of 7000 K or more. All known materials are vaporized into a gaseous plasma at such a high temperature. Also, they probably don't behave much like black-body emitters anymore.

The web site cited can give you a better idea of what is going on:

http://www.techmind.org/colour/coltemp.html

I have routinely heated magnesium oxide in an e-beam furnace until it vaporizes. The light from the glowing MgO is a very bright, almost "pure" white that can only be safely observed through welders goggles. But it isn't blue.

Carbon arcs (to my eyes) appear blue. It is debatable whether you can consider carbon to be a metal, and the light is probably coming from ionized carbon vapor in the arc, rather than solid carbon electrodes heated hot enough to emit light.

Same with TIG (tungsten inert gas) welding arcs. I'm not sure what I'm really seeing. It appears to be a very bright bluish-white, but it is probably a tungsten/helium, tungsten/argon, or tungsten/nitrogen plasma rather than hot, solid, metal tungsten that is causing the light. I don't see a blue color when I heat (and melt) tungsten with an e-beam furnace, but it is a very bright "white".

Answer 2

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Answer 3

White hot is the beset we do. It hall all colors in it including blue.

Answer 4

Much hotter than white hot will melt the metal.

But, that is very patriotic of you.

Answer 5

sure, but blue is a lower temp than red or white. look at a color/temp spectral chart