An electric bulb was filled with 100 cc of argon gas at 25 degree Celsius and 1 atm pressure. The number of atoms of argon present in bulb is
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Incandescent light bulbs are filled with an inert gas like nitrogen, argon, or krypton - so that the filament doesn't catch fire. Early ones were a vacuum. Flourecent lamps are filled with an inert gas plus mercury vapour or neon, which glows ultra-violet when charged. The inside of the bulb is painted to give it colour.
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