A thin pin of iron can be made to float on water (drinking) in a bowl.

A thin pin of iron can be made to float on water (drinking) in a bowl. This phenomenon is due to the

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surface tension of water

viscous nature of water

presence of ionic bonds in water molecules

presence of covalent bonds in water molecules

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This question was previously asked in

UPSC CAPF – 2012

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A thin pin of iron, despite being denser than water, can float on the surface of water due to surface tension. Surface tension is the property of liquid surfaces that causes them to behave like a thin elastic membrane, resisting external force. The cohesive forces between water molecules create this tension.

– Surface tension is a property of liquids arising from cohesive forces between molecules.
– It allows the liquid surface to support small objects that are denser than the liquid, provided the object is placed gently and does not break the surface.

Viscosity is a measure of a fluid’s resistance to flow. Ionic and covalent bonds describe the chemical bonding within water molecules, not the macroscopic phenomenon of an object floating on the surface. The ability of insects like water striders to walk on water is also due to surface tension.

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