Yesterday, when I came home, I went to the bathroom (lights off) and i took off my T-Shirt (100% cotton) which I wore under a Shirt (50% cotton, 50% polyester). I believe to have seen a small but well visible light arc.
Question: Is the amount of static discharge in T-Shirt big enough to produce a visible light arc?
Answer
Cotton is above polyester in the triboelectric series.
So it seems likely that the cotton shirt gained positive charge, and the 50% cotton 50% polyester shirt gained negative charge, and arcs formed.
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