Question

What determines if an object will float or sink in water?​

Answer 1

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Density is a measure of how heavy something is compared to its size. If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float.

Answer 2

Density is mass per unit volume. If an object is more compact, or denser, than water, it will sink in water. If the density of an object is less than the density of water, the object will float in water.