Say there was a theoretical soda can made of a super strong material that could hold up to the pressure of the atmosphere while weighing the same as a regular soda can. If everything was sucked out of the can, would it float in Earth's atmosphere? I think physics says it would float, but tell me what you think. Also, how much of a buoyancy force would a very light object with a vacuum in it exert? How strong would the force be if we could vacuum out a balloon and keep it taking up the same volume?