Which inert gas is most commonly used inside standard incandescent light bulbs to prevent filament evaporation?
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Most modern incandescent bulbs are filled with a mixture of argon and nitrogen. This inert gas pressure slows down the evaporation of the tungsten filament, which keeps the glass from turning black and significantly extends the lifespan of the bulb. Photo: KMJ, alpha masking by Edokter, Wikimedia Commons, CC BY-SA 3.0.
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Source: Wikipedia (CC BY-SA)
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