Oil and boat float on water while needle sinks in water. Explain.
Answers
Answer:
Like, leaf of a plant floats on the water because the density of leaf is less than the density of water. ... This causes the ship to displace water with a weight equal to the weight of the ship. On the other hand, the needle displaces more water than its weight and hence it sinks.
Explanation:
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Answer:
Detailed Explanation of Discrepant Event
A metal needle or paper clip has higher density that that of water. So when it is dropped into water, it falls down into the bottom of water. However, if we put it horizontally on the water with a lot of caution, it can float almost forever due to the surface tension of water.
Surfaces, or more generally interfaces, show some physical properties which are not found in the bulk of the same material. The best known example of such property is surface tension. Intermolecular forces create the surface tension. The water molecules at the surface are pulled in by the cohesive force between themselves and molecules inside the bulk and thus have higher potential energy than those inside. The water keeps its round surface shape because there are no water molecules outside the surface to balance this inward pull. This cohesive force acts like a elastic membrane which resists being torn
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