Why do air bubbles form at the bottom of a glass of sparkling wine?

[Rajini]

When one pour sparkling wine in a glass...the air bubbles, which are formed always in the bottom (or bottom surface of glass) of the glass surface and travels upwards in a smooth line..

I was wondering..is there any good explanation (why these bubbles are always formed in bottom) in terms of physics for this...

thanks

 

[maniaciswicke]

think it would be because CO2 disolved in the wine is heavier than just wine so it sinks to the bottom

if that's the reason i wonder where the bubbles would form in space with not much gravity

 

[mgb_phys]

They shouldn't just form in the bottom.
They generally form wherever there is a nucleation site, a tiny scratch or bit of dust on the glass.
If they all form at the bottom it's probably due to either faults in the way the glass was made (leaving the bottom rough) or the bottom of the glass is very dirty.

 

[Rajini]

So if the glass is perfectly smooth (100 % even though out the inner surface)..these bubbles would be formed everywhere from wine..(edited text)
any idea on density of wine!
thanks for reply

 

[mgb_phys]

A little bit more or less than water depending on the sugar content.
Sweet wines have a higher density (more sugar less alcohol) upto 1.010
Dry wines (more alcohol, less sugar ) are 0.990 to 1.000