#incandescentbulb

[marymargit]

Let us bask in the #artificialsunlight of the #incandescentbulb #catsofinstagram #sweetpea #pennsylvaniaiscoldaf

[plantstoplanets-blog]

Above is a photo of a halogen light bulb, a variation of the classic incandescent light bulb that many know to be invented by Thomas Edison. What makes Edison stand out as the inventor of the light bulb is not necessarily the actual thing itself, but the factors he combined to produce a successful bulb. For the incandescent bulb, there is a long-lasting filament, which now is made of tungsten. The casing, made of glass, prevents oxygen in the air from reacting with the tungsten, and it should be noted that the inside of the bulb is a vacuum that is then filled with an inert gas such as argon to reduce the rate of evaporation of the filament, as in an incandescent bulb, tungsten atoms can "evaporate" off the filament and blacken the bulb. A halogen light bulb is an improvement on the incandescent bulb. The filament is still made of tungsten, however inside the bulb, either iodine or bromine gas is present at a much higher pressure (7-8atm). To withstand these pressures, normal glass is replaced with fused quartz. The presence of the halogen gas (either iodine or bromine) prevents the tungsten from thinning. As the tungsten filament is heated and it loses atoms, the iodine/bromine will bind to these atoms on the run. When the light is switched off and the halogen can cool down, the tungsten atoms will once again bond with the filament. This process is called the "Halogen Cycle". The tungsten itself emits light as its electrons gain energy and then re-emit it as wavelengths of light that, luckily for us, are in the visible light spectrum. #light #lightbulbs #incandescentbulb #halogenbulb #halogens #iodine #bromine #tungsten #quartz #glass #physics #science #sciences