I was explaining how to levitate small objects with an electric field using a balloon. While atmospheric pressure is the force pushing an object up or down depending on its density, ultimately up and down is defined by the electric field in-between the dome and the ground.
...Dependent upon weight, not density. We already know and can and have tested that all objects 'float' equally in weightless environments despite having varying densities. How many times are you going to ignore this? Just watch a video of the inside of a vomit comet. People wouldn't float around in the cabin during a zero-g maneuver if your idea was true because the air is less dense than people; it's a closed, pressurized cabin. If you have the cash, take a ride yourself and bring a helium balloon with you; it, too, will float just like everything else in the cabin.