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No. Weight = mass * g, where g = 9.8 m/s2, a constant. The mass of an object does not change unless it undergoes a chemical or nuclear change. Hence its weight is a constant too.

However, the "apparent weight" changes because the inherent weight is now compensated somewhat by buoyancy, acting in the opposite direction as gravity. The weight of a piece of wood in water will be completely opposed by the buoyancy and so it floats. The weight of a concrete block cannot be completely compensated by buoyancy and so it sinks.

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Q: Does an objects weight change in the water?
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