A needle smeared with Vaseline when lowered slowly on the surface of water in a horizontal position appears to float. The phenomenon is an example of:
Q1. A needle smeared with Vaseline when lowered slowly on the surface of water in a horizontal position appears to float. The phenomenon is an example of:
Answer: Surface tension
Explanation: Surface tension arises from cohesive forces between water molecules at the surface, creating a thin elastic-like film strong enough to support small objects like a greased needle.