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14 days agoThat’s not density, that’s just the shape of the material. 100kg of metal in the shape of a boat or a cube is still 100kg, it doesn’t make it lighter. The buoyancy of something does not mean it’s more or less dense than something else.
That’s the “average density” of the metal boat + air not of the boat itself, a material has a fixed density at fixed temperature and pressure.
For example at 20°C:
https://en.wikipedia.org/wiki/Gold)