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प्रश्न
Why does a greased razor blade float on the surface of water?
लघु उत्तर
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उत्तर
A greased razor blade can float on water because the surface tension of water acts like a stretched membrane and supports the blade. Grease prevents water from wetting the blade, so the blade does not easily break the surface of the water. So, if placed carefully, the upward force from surface tension balances its weight, and the blade floats.
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