Fish take in Oxygen from the water through their Gills, this is how they breathe. They don't breathe in the same way we do.
To determine the volume of air needed to float an object, you need to know the density of air and the weight of the object. For example, if the density of air is approximately 0.075 lb/ft³, then to float a 1000-pound object, you would need approximately 13,333.33 ft³ of air (1000 lb / 0.075 lb/ft³ = 13,333.33 ft³).
Buoyant means: Tending to float on a liquid or rise in air or gas
Objects filled with air float on water because the density of air is much lower than the density of water. This creates buoyant force, which causes the object to float. The air-filled object displaces an amount of water equal to its weight, allowing it to stay afloat.
A bottle, though heavier than water, can be made to float by trapping air inside of it. This same bottle can be made to sink by filling it with water, or a substance heavier than water. It can again float by emptying it and trapping air in it.
The only things that "float" in air, are things that are lighter than air, and this is because they displace a quantity of air that weighs more than the thing that is floating. This is also true of things that float in water or any other fluid. As for heavier-than-air things that "float" (fly), these are kept aloft by the motion of air, or by the motion of the thing through the air, which amounts to the same thing. In either case, air is passing the flying thing (for instance, an airplane wing) above and below it, creating low pressure above and high pressure below, thereby lifting the thing off the ground. This works only for things that are aerodynamically correct, and these are called airfoils - an airplane wing, a helicopter rotor and a kite are common examples.
that's impossible because gravity is to powerful so it keeps pulling the object down
Well, buoyancy is capacity to float in liquid. So the object needs to have air to make it float an example for an boat the Titanic for example was really heavy it was made out of steel so it had air in the bottom to make the ship float.
If it less dense
(mass of object)/(volume of object) ≤ 1.225 kg/m3 (this is the approximate density of air at normal atmospheric conditions - your mileage may vary)
no and mass is air
put rockets on it or attach fishing line to the top of it then put the other end on a long stick.
You could get thin, 'invisible' thread and tie it to your character
It could, if it contained enough air. To float on water, you would need about 1 liter of air for every kilogram you want to keep afloat.
To determine the volume of air needed to float an object, you need to know the density of air and the weight of the object. For example, if the density of air is approximately 0.075 lb/ft³, then to float a 1000-pound object, you would need approximately 13,333.33 ft³ of air (1000 lb / 0.075 lb/ft³ = 13,333.33 ft³).
The Object's name is an "Air Craft"If its not... Then I don't really know.
Buoyant means: Tending to float on a liquid or rise in air or gas
you will float up in the air