Why is there an indentation in bottom of wine bottles?

Answer 1

The hollow bottom has nothing to do with easier pouring but only with glass STRENGTH.

Glass is weak in bending (not many 12ins rulers about!) but strong in tension and compression.

The "cone" at the base is under compression form the pressure inside the bottle and this puts the end of the bottle (the tube part) into tension. If the base was flat, instead of cone shaped , it would 'bend' from the pressure and thus break.

Answer 2

For the cork capping machine to 'grab' the bottle firmly, when it is being capped. And to lessen the gas force formed by the wine when the bottle is being opened.

The concave indentation at the bottom of a wine bottle is called a punt. There is much discussion as to why they are part of the design of a wine bottle but the most realistic answer is long ago when wine bottles were hand blown, putting a punt in the bottom of the bottle ensured that the glass blower wouldn't create a convex bottom by accident, thus making the bottle unable to stand up. Also it provided more structural strength for wines bottled under pressure (champagne). People also say the punt helps channel sediment around the edges of the bottle.

Nowadays, it has become merely traditional to include a punt in a bottle design. Although you can look like a pro pouring the wine if you stick your thumb in it.

Answer 3

Most bottles these days are generally hollow on the bottom. It is to keep the bottles more stable when they are stacked and shipped.

It is not a marketing trick to fool you from the real volume or something. This hollow bottom thing purely helps with the stacking.

The bottle top of bottle A fits in the hollow part of bottle B, well enough to significantly decrease the chance of the bottles shifting or sliding while being stacked, or from rolling should they be stacked sideways.

Answer 4

for the fermentation process to take place

Answer 5

PUNT is the name of the indentation found in the bottom of most wine bottles.

Answer 6

The indentation at the bottom of a wine bottle, the punt, strengthens it.

Answer 7

If you mean the "dent" in the bottom, it's called a punt.