Static electricity forms when an electric charge builds up (lots of different ways) and it has no path to ground. This “no path to ground” is what is intended to be conveyed by the term “static”.
So materials that can take a charge, but not pass one very well will build static charge. The reason a little water spritzed over the surface of these materials releases the charge is because the water allows just enough current to pass through it that it finds a path. similarly when people touch they provide a path as well – hence the shock!
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