Question

two empty plastic bottles one small and one big are pushed below the surface of water which one has greater tendency to rise swiftly. give reason?

Answer 1

Tap water has carbonic acid, that is just CO2 that is dissolved in the water. If you de-gas the water there may be less bubbles. The porous inside of your water bottle (presumably plastic) is allowing the dissolved gasses to attach to the walls, release the water molecule and then let the gas buildup. The gas bubbles that are stuck to the walls need to

1) get big enough to escape the walls or

2) receive a large enough shock to get them to release on their own.

The plastic bottle isn't perfectly smooth. There are microscopic pockets of air along the walls of the bottle. As bubbles form, they attract each other, Sort of like watching water roll down the window on a rainy day. So the question isn't necessarily why the are attracted to the walls, but what keeps the air in place along the walls of the bottle.