1. The problem statement, all variables and given/known data - What is the buoyant force that acts on a fully submerged 1-L bottle of water? What is the buoyant force that acts on it if it is full of air, not water, but is still fully submerged? Assume you'd have to hold it under water. 2. Relevant equations - Fb= V x D x G 3. The attempt at a solution - I know the volume is 1L, and G is 9.8 M/S. I'm unsure with the density therefore I can't get an answer.