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# Form 4 Physics: Floating and sinking online lessons

Meaning and formulae for calculating relative density

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Applying Archimedes principle, the relative density‘d’; d = weight of substance in air / upthrust in water or d = W /u
Hence d = W / u = W /( W2) – W1, the actual density, ρ of an object can be obtained as follows
ρ of an object = d × 1,000 kgm^-3.