The surprisingly baffling science of static electricity

Static electricity is so commonplace that it can come across as simple. Rub a balloon against your head, and the transfer of charges will make your hair stand on end. Shuffle your feet on a carpet, and the charge imbalance you produce can shock an innocent passer-by.

So it might come as a surprise that static electricity — which arises from what researchers in the field call the triboelectric effect — has left scientists racking their brains for centuries. Some of the basics are clear. Materials transfer charges when they’re rubbed or otherwise come into contact with each other: one becomes more positively charged and the other more negatively charged. Opposite charges attract whereas identical charges repel, and ta-da, you have a primary-school science experiment.

But most everything else in this field remains baffling. Is it the electrons, ions or bits of material that transfer the charge? Why do some materials charge positively and others negatively? What happens when two samples of the same material come into contact? For instance, when “rubbing a balloon on a balloon”, says experimental physicist Scott Waitukaitis at the Institute of Science and Technology Austria in Klosterneuburg. A big part of the problem is that experiments tend to misbehave, with the same procedures producing different results.

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