DAY WILLIAMS / SCIENCE PHOTO LIBRARY DAY WILLIAMS / SCIENCE PHOTO LIBRARY
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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