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- Newsgroups: sci.physics
- Subject: Re: What causes electrical shock?
- Message-ID: <mcirvin.727665039@husc.harvard.edu>
- From: mcirvin@husc8.harvard.edu (Matt McIrvin)
- Date: 22 Jan 93 01:10:39 GMT
- References: <1993Jan21.201040.15276@news.unomaha.edu>
- Nntp-Posting-Host: husc8.harvard.edu
- Lines: 25
-
- djclute@cwis.unomaha.edu (Daniel Jonathan Clute) writes:
-
- >Vacation over, I'm still seeking the answers to two particular questions:
- >1) what causes static shock (low humidity?), and 2) what is the proper
- >technique to "ground out" (rub on wood?).
-
- Static charges tend to build up in conditions of low humidity because
- dry air is a better insulator; moist air will carry charges off of the
- surfaces of objects to restore neutrality. As for what causes the
- charge to build up when you rub against things like shag carpets, I
- believe that that subject, after millenia of observations, is still
- quite poorly understood.
-
- Touching a big wooden object might work well as a means of grounding,
- since it's likely to possess less surface charge than you do (big
- wooden objects don't shuffle around on rugs) and will carry the charge
- away slowly so you don't get zapped. A more spectacular means is to
- carry around something made of metal and touch doorknobs, faucets,
- etc. with that first. The spark will jump, but you won't feel it
- because the current is flowing through the area of contact between
- your hand and the metal rather than jumping across a gap from a small
- spot on your finger.
-
- --
- Matt McIrvin
-