What Fraction Of A Piece Of Granite Will Be Submerged When It Floats In Mercury?


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The density of mercury is about 13.534 g/cm^3 at room temperature. The density of granite lies between 2.65 and 2.75 g/cm^3. So it only takes between 2.65/13.534 ≈ .1958 and 2.75/13.534 ≈ .2032 cm^3 of mercury to hold up 1 cm^3 of granite.

Between 19.6% and 20.3% of the granite will be submerged in the mercury, depending on the density of the granite. (That's about 1/5 of the granite.)

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