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Gravitation — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceGravitation2 Marks
Question
An empty plastic bottle floats, while a plastic bottle filled with sand sinks in water. Why?
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Answer

As the density of the plastic is less than water it floats on the water. on the other hand when the bottle is filled with water it's density becomes more than the water so it sinks

$\text{Density} = \frac{\text{mass}} {\text{volume}}$

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