What atomic forces are acting to resist me pushing an air filled bottle underwater?

Question

Yes air is less dense than water but how does the bottle know to rise or indeed to move? It's not electromagnetism I think. Does this have a relation to gravitational forces? Is it to do with the number of protons in the molecules of the different substances?

Answer 1

You may be overthinking it ...Buoyancy is the force that is exerted on an immersed object and is equal to weight of fluid displaced by the object.

Jim