ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Sparks from static electricity discharges between a fork and four electrodes. Many sparks were used to make this image, as for a given discharge only one spark will form. Each spark follows the line of least resistance through the air at the time. Note that the top prong of the fork forms discharges to both electrodes at top left. The light of each spark is created by the ionisation of gas atoms along its path.
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