The ridges on the bottom of beer bottles

On the bottom of beer bottles, there are ridges that look like the second markers on a wall clock. Do these ridges prevent the bottle from sliding? How does that work?

Similarly, why does salt on a napkin prevent a bottle or glass from sticking to the napkin itself?

Beer Drinkers of the World… the knowledge you’ve been holding for the right time has come!

Part one: prevents slippage at the bottling plant.

Part two: moisture acts as an adhesive, but salt absorbs the moisture and prevents it from binding the two parts.

bottles often get wet from spillage or condensation. Gravity pulls the moisture to the bottom. The ridges give the moisture a channel similar to the grooves in tires and make the bottle less likely to slide.

Beer & champagne express CO2. If it becomes trapped under the bottle, the pressures under the bottle and outside the bottle could be different, causing the bottle to tip over or otherwise move.