What does the depression at the bottom of the bottle do?

Generally speaking, the groove of a wine bottle has two functions.

First, let the bottle stand upright.

Because glass bottles used to be blown by hand. The bottom of the bottle is recessed into the bottle body, so that the bottle body can stand on the table stably. And modern technology has been able to stand steadily, even if the bottom of the bottle is flat.

Second, accumulate the sediment in the wine.

The groove can collect wine dregs, and when pouring wine, the wine dregs are stuck in the groove to prevent them from mixing with wine.

On the other hand, the size of the groove is related to the volume of the bottle itself. An ordinary wine bottle can hold 750 ml of wine. Therefore, in order to ensure the quantitative volume, if the bottle body is relatively large, the groove at the bottom of the bottle will be relatively deep.