Why do I keep getting shocked?
Because the air is dry. In humid air a thin film of water on every surface lets electric charge leak away. In dry air it can't, so charge builds up on you until it jumps to the next doorknob.
Dry skin builds and holds charge.
The same dry air dries out your nose and throat.
Show me why1 min
Where the charge comes from
When two different materials touch and pull apart, like socks on carpet or your back on a car seat, electrons hop from one to the other. You walk away carrying a little extra charge. The energy is tiny, but the voltage can reach thousands of volts, enough to jump a small gap as a spark when your finger nears metal.
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Why dry air makes it worse
In humid air, surfaces, including your skin and clothes, hold an invisible film of water. Water conducts, so charge drains away before it can build. When the dew point is low that film doesn't form and the charge stays put. Winter is worst: cold outdoor air holds little water, and heating it indoors drops the relative humidity even further.
How to get fewer shocks
- Run a humidifier. Indoor humidity of about 30 to 50% is comfortable and cuts static.
- Moisturize. Dry skin holds charge more easily.
- Touch metal with a key or coin first, so the spark jumps from that instead of your fingertip.
- Wear cotton. It builds up less charge than wool and many synthetics.
Questions people ask
- Why do I get shocked getting out of the car?
- Sliding across the seat charges you up, and dry air keeps that charge on you until your hand meets the metal door.
- Why is static worse in winter?
- Cold air holds little water, and heating it indoors drops the humidity even more, so charge can't leak away.
- What humidity stops static?
- Static becomes much less of a problem as indoor humidity rises toward 40 to 50%.