Opening a bottle of soda or champagne...

gafanhoto

When we open a bottle of soda or champagne, a white cloud raises briefly. Based on thermodynamics, why does it happen?

haruspex

The sudden expansion of the bubbles causes adiabatic cooling. (This is allowed thermodynamically because an equalisation of pressures produces more possibilities for how the molecules are distributed, so entropy increases.) It can be enough to cause some water vapour to condense briefly. You might not observe the cloud on a warm dry day.

gafanhoto

Thanks a lot, I thought the same, but couldn't find a confirmation and you provide me with that one!