Question

Why do the empty plastic bottle float in water
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Answer 1

Answer:

An empty plastic bottle has air inside it which means that it reduces its density due to which it is able to float over water. ... In other words, its density is less than the density of water due to which reason it floats.

or

The gravitational pull on the empty plastic bottle is less than the upthrust force exerted on it by the water. In other words, its density is less than the density of water therefore it floats. On the other hand, a plastic bottle filled with sand sinks as the gravitational pull (weight) on it is more than the upthrust force of water.

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Answer 2

Answer:

they float on water as the density of water is greater then the density of the plastic bottle