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How Do You Measure Density?

A solid objec...

Question

A solid object of relative density 1.25 is found to weigh 12g in water. Find its weight in air.

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Solution

Given,
Relative density of solid = 1.25
Weight of solid in water = $0.012 \times 10 = 0.12 N$
Weight of air = ?
$R e l a t i v e d e n s i t y = \frac{w e i g h t i n a i r}{w e i g h t i n a i r - w e i g h t i n w a t e r}$
$1.25 = \frac{w e i g h t i n a i r}{w e i g h t i n a i r - 0.12}$
Weight in air = 0.6 N

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