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From the previous study of electromagnetic radiation in Physics, we learned that color is related to the frequency (or wavelength) of light. Yet color is also related to temperature. For instance, by observing colors of the stars, we could tell which stars are hotter and which ones are cooler.
Since all objects are made up of atoms, which vibrate when thermal energy is received from an outside source. The greater the thermal energy received, the more vigorously the atoms vibrate. If the atoms are vibrating fast enough, it may emit light. Cooler objects emit primarily low frequency waves, while warmer objects emit waves with primarily higher frequencies. Therefore, objects at higher temperatures emit waves of high enough frequency to be visible and we start to see red colored objects, also known as "red hot" objects. If the temperature of an object continues to rise, the emitted wavelengths become even higher in frequency, and the observed color becomes orange or yellow. At even higher temperatures, the amount of visible light emitted by the object covers the entire visible spectrum about equally and our eyes see it as white. This is what is known as a "white hot" object.
According to my research, no matter what kind of materials an object is made of, it will glow white when its temperature is in the range of 1,500 to 11,000 K.
Carine Fang -- 2001