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Why does a needle floats on water but sink when some impurities are added.

Asked by Arun Iyer 19th February 2011, 5:29 PM
Answered by Expert
Answer:
Dear student

The surface tension of clean water being higher than that of water mixed with impurities, it can support the weight of a needle due to its surface tension. By addition of impurity, the surface tension of water reduces, thereby resulting in the sinking of the needle.

 
Hope this clarifies your doubt.
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Team
Topperlearning
Answered by Expert 20th February 2011, 11:47 AM
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