Why tap the beer cans?

Question

I always do it and i dont know why, when I'm going to open a beer in a can, I tap the top

Answer 1

I don't think it really works, but fluid dynamics are really strange.

A side effect of tapping on the top of the can is that it delays opening the can, so it might help the CO2 settle a bit more in the interval, but that has more to do with the waiting than the tapping.

Answer 2

It is supposed to cut down on the foam. I do it if I drop one

Answer 3

Here you go buddy!

http://chemistry.about.com/od/howthingsw...

Hope it helps

Answer 4

I don't know if it really works but you tap the top of a beer can to keep it from foaming over.