Correct Answer - Option 2 : Relative density of liquids
Explanation -
- Whether an object sinks or floats is determined by the relative densities of the object and the liquid in which it is put.
- The ratio of a substance's density to the density of given reference material is known as relative density.
- An object with a higher density than the liquid in which it is submerged can sink.
- Floating objects have a lower density than the liquid they are in, hence they float.
- Consider ships, which can be tens of thousands of tonnes and still float. That's because it's not just about how big anything is that determines whether it floats or sinks.
- Hence, the relative density of ships is less than that of water so it floats.
- The same goes for liquids. Oils have a relative density higher than water so they remain on top of water forming a different layer.
So, the correct answer to this question is - relative density of liquids, as it described whether the liquid will float or sink.
