The specific weight of water at ordinary pressure and temperature is 9.81 \mathrm{kN} / \mathrm{m}^3 . The specific gravity of mercury is13.56. Compute the density of water and the specific weight and density of mercury.

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\begin{aligned}\rho_{\text {water }} & =\frac{9.81 \mathrm{kN} / \mathrm{m}^3}{9.81 \mathrm{~m} / \mathrm{s}^2}=1.00 \mathrm{Mg} / \mathrm{m}^3=1.00 \mathrm{~g} / \mathrm{mL} & & \\\gamma_{\text {mercury }} & =s_{\text {mercury }} \gamma_{\text {water }}=13.56(9.81)=133.0 \mathrm{kN} / \mathrm{m}^3 \\\rho_{\text {mercury }} & =s_{\text {mercury }} \rho_{\text {water }}=13.56(1.00)=13.56 \mathrm{Mg} / \mathrm{m}^3 \end{aligned}

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