Neon signs

Neon signs

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Credit: DAY WILLIAMS/SCIENCE PHOTO LIBRARY

Caption: Neon signs. Neon emission tube. A neon lamp consists of a glass tube containing neon gas at a low pressure and two metal electrodes at either end. When an voltage is applied, the gas becomes ionized and begins to glow as it transmits a current between the electrodes. Pure neon has a red-orange glow. Different colours can be achieved by the addition of impurities such as argon or krypton. Neon lights are more efficient than carbon filament lamps.

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Keywords: chemistry, electric light, electric lights, electricity, emission, emission tube, emission tubes, glass, glass tube, light, lights, luminescent lighting, neon, neon emission tube, neon gas, neon lamp, neon lamps, neon light, neon lights, noble gases, notice, orange, red, sign, tube, tubes

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