Why does a needle floats on water but sink when some impurities are added.
Asked by Arun Iyer | 19th Feb, 2011, 05:29: PM
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.
Answered by | 20th Feb, 2011, 11:47: AM
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