On Friday, 9 December 2016 20:58:01 UTC, David Lang wrote:
I understood it is capacitance.
Wot dat?

Capacitance is the ability of a body to store electric charge.

When you rub your feet on a nylon carpet, your body becomes a capacitor and stores an electric charge.

When you touch the ear of the boy sitting next to you, a spark jumps across to his ear and gives him a static electric shock. This is your body discharging.

At least that's how it worked in French lessons in school. (The French classroom was the only one with carpet.)

Owain