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The rebound phenomenon with a glass dielectric capacitor is quite
dramatic. You can demonstrate it with a Leiden jar as well. In
fact I do it with a disassemblable Leiden jar*. I can charge the
jar and remove the aluminum electrodes. After touching them
together, I replace them and a healthy arc can be drawn off the
jar. After a minute or so I can draw another spark.
It is clear that the energy is somehow stored in the glass. Is it
chemical energy? What does it matter what it is called?