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if the object has more density than water then it will sink and if it has less density than water then it will float on the surface of the water.
relative density means to compare the density of any object to the density of water.relative density has no S.I unit since it is the ratio of objects which has same S.I.unit.
hydrogen filled balloons float on the surface of the water because it's density is less then that of the density of the water.less than 1g/cm^3. (1g/cm^3 is the density of water).
       i hope that this will help u...............:))

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