Why does pouring beer onto the sides of the glass prevent it from foaming, as opposed to pouring it straight down the middle?

Question

Why does pouring beer onto the sides of the glass prevent it from foaming, as opposed to pouring it straight down the middle?

In: 83

Answer 1

Why is going down a slide fun and jumping off a building hurts?

Pouring down the side causes less if a disturbance in the beer, causing less carbonation to be allowed to come out of solution and form foam.