There is a two foot long plastic boat in the bathtub, the boat is filled with metal nuts and bolts. The boat tips over, dumping the contents into the water. With the nuts and bolts in the water, will the water level in the bathtub rise, fall or stay the same as it was when the nuts and bolts were in the boat?

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Due to the weight and construction of the metal nuts and bolts, in this case, the water level will go down. A floating object displaces its weight and a submerged object displaces its volume.