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Sink A Needle

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#25647
Fun:*** (2.73)
Difficulty:** (1.84)
Category:Science
Submitted By:haldir***
Corrected By:calmsavior

 

 

 



How can you sink a needle that is floating in a bowl of water without touching it, dropping anything on it, or shaking the bowl?


Answer

Dish soap! The molecules in dish soap separate the water molecules from each other, and since the surface tension of the water is no longer as great, the needle sinks!

This experiment actually works, the trick is using some sewing thread to lower the needle onto the water.

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