Originally Posted by MoAlpha

Coffee science question: I have a burr grinder and the static charge it puts on the coffee makes it fly out of the little receptacle, stick to the housing of the grinder, and get all over the counter. However, I have recently discovered that if I set it one tick finer than the usual grind I used for the drip machine at home, no charge. When I grind it coarse for the French press on the boat, I don’t think it’s that that sticky either, but it’s been a few weeks and I’m not sure.

Anyway, why does a small change in grind make such a difference?