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Everything above absolute zero gives off radiation. We can only see a small fraction of that radiation. Some snakes see heat that we can see only with special equipment. Some insects see ultraviolet which we also need special equipment to see. We see the radiation in the colors that the sun gives off. At night we see very little. If something is heated hot enough, it gives off radiation close to the color that the sun gives off. You can see that when you look at a gas stove. You can see the hottest blue flame then a cooler yellow flame and then a cooler red flame. If you run electricity through some substances, you will heat them up until they give off heat or light. Thus, with certain materials you can heat a filament until it reaches the temperature where it gives off a white light. The filament is enclosed in glass to keep out oxygen. Otherwise the filament would burn up. So a filament gets real hot like a stove and then gives off light.

Florescent lights do not need to get nearly near as hot and use far less electricity. Soon there will be diode bulbs that use even less.

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Violette Gibson

Lvl 10
3y ago

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