The light emission of the bulb belongs to physical change, because when the bulb is powered on, the tungsten wire in the bulb will produce white light at a high temperature above 3000 ℃, but the tungsten wire and the filled gas do not have chemical reaction and no new substances are generated, so it does not belong to chemical change, but physical change. The bulb is Henry & middot; Invented by Goebbels. Edison only found the appropriate materials on the original basis and invented the incandescent lamp with strong practicability.
The exact technical name of the bulb is incandescent lamp. It is a kind of lamp that uses resistance to heat the thin wire to incandescence through power on.
The most common function of light bulbs is lighting. With the development of society, the use of light bulbs also has different changes, and gradually began to have functional lamps for different purposes, such as' automobile, beautifying the environment, decoration 'and so on. （DengPaoFaGuangShiShenMeBianHua）