A thin needle floats on water , but on mixing some detergent in water, the needle sinks. Why?
Answers
Answer:
The iron needle will float on clean water but sink when some detergent is added to this water. Surface active substances such as detergents decrease the surface tension of the liquid. Surface tension of a liquid is a molecular phenomenon of liquids involving the force of cohesion among the liquid molecules.
Explanation:
OK I'm gonna try my best to make this sound as naturally written as possible so when you answer it doesn't look it it was copied:
The thin needle floats on the water due to the surface tension the top of the water has. If detergent is added to the water, the membrane formed breaks and surface tension decrease. Due to that the needle continues to sink in the water due to its density and the decrease in the surface tension