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2015-12-11T19:02:56+05:30

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The ratio of the density of the sample to the density of a standard substance is known as relative density. Like the water for solid or liquid and air for gas.

That is,
D =      Wa/Wa – Ww
D =      80/80-64
D =      80/16
D =      5

As we can see that the relative density is greater than 1 so the object will sink into the water. 
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