2007-07-27 07:50:42 · 6 answers · asked by bikejon 1 in Science & Mathematics ➔ Physics
Thermochromic materials such as metals reversibly change color as their temperature is changed.
Remember, color is a function of the human visual system, and is not an intrinsic property. Objects don't "have" color, they give off light that "appears" to be a color. Spectral power distributions exist in the physical world, but color exists only in the mind of the beholder.
The color of the light coming from a hot metal object has its origin in emission: the metal object itself is a source of light with a color determined by its spectra.
To learn more and to view an excellent chart displaing the tempertaure of metals by color please go to the weblink provided below in the sources section.
2007-07-31 04:31:37 · answer #1 · answered by ? 6 · 0⤊ 0⤋
Anything can change color when it is heated. As long as it does not burn up or evaporate it will be a dull red hot, a bright red hot, or white hot at different temperatures.
That is easy to see in metal because it just says there and can be observed easily. You could instead try that with stones and get equivalent results.
You are looking at the radiation from a heated object. It has nothing to do with oxidation that could make oxides that show different colors. This is the heat itself.
2007-07-27 12:11:35 · answer #2 · answered by Rich Z 7 · 0⤊ 0⤋
something can replace colour whilst that's heated. as lengthy because it would not use up or evaporate it is going to likely be a lifeless pink warm, a extraordinary pink warm, or white warm at diverse temperatures. it is uncomplicated to confirm in metallic simply by fact it in simple terms says there and can be stated truly. you need to rather attempt that with stones and get equivalent consequences. you're finding on the radiation from a heated merchandise. It has no longer something to do with oxidation which could make oxides that coach diverse colorings. that's the warmth itself.
2016-11-10 09:42:19 · answer #3 · answered by deperte 4 · 0⤊ 0⤋
Some metals can oxidize very quickly when hot, and the oxides give it a color.
2007-07-27 07:54:16 · answer #4 · answered by John 7 · 1⤊ 3⤋
it is because electrons get excited and absorb energy and thus go into higher energy level.. then they drop down releasing the energy in photons of light.. and the difference of energy released in the drop controls the colour of the light....
2007-07-27 08:10:31 · answer #5 · answered by Anonymous · 0⤊ 1⤋
wein's displacement law
lamda (max) * T = 0.2896 (cm- deg K)
when T increases, lamda (max) decreases from infrared to violet-end of the spectrum
2007-07-27 07:57:25 · answer #6 · answered by anil bakshi 7 · 2⤊ 1⤋