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2015-03-10T17:37:03+05:30

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Relative density of a material is defined as the ratio of density of the material to that of density of water.

density\ of\ water,\ \rho_w=10^3\ kg/m^3\\ density\ of\ mercury= \rho_m\\ \\ RD_{mercury}=13.6\\ \\ \Rightarrow \frac{\rho_m}{\rho_w}=13.6 \\ \\ \Rightarrow \rho_m=13.6  \times \rho_w\\ \\ \Rightarrow \rho_m=\boxed{13.6  \times 10^3\ kg/m^3}
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2015-03-10T18:21:40+05:30

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RD is the ratio between the density of an object and the density of water.
It is found by a formula w1 /(w2-w1)
where w1=weight of an object
           w2=weight of water
13.6=d1/1g/m³
d1=13.6x1g/m³
d1=13.6g/m³
in si unit,the density of mercury is 13.6g/m³
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