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Education
Chemistry In Pictures
Chemistry in Pictures: Glow discharge tube
by Craig Bettenhausen
August 24, 2023
This air in this tube is being subjected to a high-voltage electric field, which frees some of the electrons that would normally cling tightly to the N2, O2, and other atmospheric gases inside, creating a plasma. The staff at the Exploratorium, a science museum in San Francisco, have set this one up with a magnet to perturb the electric field and a switch-operated vent hole to tweak the airflow, allowing visitors to manipulate the light show.
Credit: Craig Bettenhausen/C&EN
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