A solid weighs 120 gf in air and 105 gf when it is completely immersed in water. Calculate the relative density of solid.



Weight of the solid in air (W1) = 120 gf

Weight of the solid when completely immersed in water (W2) = 105 gf

RD of solid = W_1\over W_1 - W_2

= 120\over 120 - 105 = 8

∴ Relative density of solid = 8

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