For the science fiction novel with the same name, see Incandescence (novel) Incandescence's the emission of light (visible electromagnetic radiation) from a hot body due to its temperature. The term derives from the verb incandesce, to glow white. In practice, most bodies start to glow visibly in the dark around 400°C (about 670K). Their incandescence isn't strictly zero below that temperature, but it's too weak in the visible spectrum to be visible. The incandescence of a theoretically pe… (More on Incandescent)