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Regarding why an iron ball floats on mercury but sinks in water, which is correct?

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1. Regarding why an iron ball floats on mercury but sinks in water, which is correct?

The ball floats on mercury because iron’s density is actually LESS than mercury’s density, not more, contrary to a common misconception

Iron’s specific gravity genuinely is greater than mercury’s

Iron and mercury share exactly the same density

Iron floats on mercury purely due to surface tension effects

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