Answers

2016-02-21T17:22:02+05:30
RD of a substaince =density of a substaince/density of equal volume of water at 4 degree celcius
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2016-02-21T17:27:54+05:30
Relative density is the ratio of the density of the substance and the ratio of of the other given material 
for example :density of light in vacuum /density of light in diamond
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