How to calculate mass of water in kettle from volume and density?

The change in weight when an object is immersed is due to displacement of water (the buoyancy effect). The mass of water that has been displaced is equal to the change in weight. Given that density of water is 1 (for this example), then you know the volume of the solid (it is equal to the volume of the displaced water).

Divide weight in air by that volume to get its density.

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