I noticed this recently when I pour myself a glass of soda and I want to know why this is. When I pour in the soda sometimes the ice will stay at the bottom not floating up for a while even after it is completely submerged but there is a point where once I add a little bit more water where the ice just floats up. This seems really counterintuitive to me as the ice is already under water an inch or so but once I add just a little.bit more it floats up to the top.
To explain what I see in the simplest way possible
I put ice into a cup the cup is shaped like a rounded out v with a flat bottom
I pour soda into the cup and for a while the ice is a solid inch or so under water staying there
I add a little bit more soda and all of a sudden the ice floats up to the top
Any ideas as to why this happened because the ice is fully submerged so shouldn't adding more water make it want to stay down more
My current working theory is that the co2 bubbles lower the density of the soda so the ice can sink but at a certain point the co2 bubbles are cooled just enough so they take up less space and the ice floats back up So like Pour in soda with room temp bubbles (ice is denser) After a bit ice cools bubbles down so they take up less space and soda is denser so ice floats back up
At least that's what I think I'm not sure at all about this as I only have 2 college physics courses under my belt