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Below 35% RH, static power will build-up in an object, which will discharge to earth through anything that comes into contact with it, this is normally the human body.
Walking over a nylon carpet, wearing man-made soled shoes could generate a static charge of 35,000 volts in a dry atmosphere. Raising the humidity would reduce the dicharge to about 1,500 volts, less than 5%.
Raising the humidity level above 35% allows all surfaces to become covered in a microscopic film of moisture that dissipates the static charge harmlessly to earth.
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