A solid weighs 80 g in air, 68 g in water and 60 gram in oil. Calculate the relative density of oil and solid.

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Solution

$R e l a t i v e d e n s i t y o f a o b j e c t c a n b e \frac{W e i g h t o f t h e o b j e c t i n a i r}{w e i g h t i n a i r - w e i g h t o f t h e o b j e c t i n w a t e r} T h e r e f o r e o n s u b s t i t u i n g t h e v a l u e s, D = \frac{80 g}{80 g - 68 g} = \frac{80}{12} = 6.67 S i m i l i a r y t h e r e l a t i v e d e n s i t y o f o i l c a n b e c a l c u l a t e d R E l a t i v e d e n s i t y = \frac{L o s s o f w e i g h t i n o i l}{l o s s o f w e i g h t i n w a t e r} D'' = \frac{80 g - 60 g}{80 g - 68 g} D'' = 1.67$

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