The 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. #CENChemPics by Craig Bettenhausen/C&EN. https://cen.a
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