Do bigger objects always have a greater density than smaller ones?

Question

anonymous · Answer

$$\rho = m / V$$$$Density = mass/volume $$ you be the judge

anonymous · Answer

oh so the answer is no?

mrnood · Answer

Jupiter has 
Mean radius 69,911±6 km 
Density = 1.326 g/cm3

Mercury has
Mean Radius 2,439.7±1.0 km
Density = 5.427 g/cm3

anonymous · Answer

Density is the property of material of substance .so it will be constant for any substance.it is just like resistivity

anonymous · Answer

another example. Saturn is much larger than the Earth However, Earth is solid rock (more mass, small volume) and Saturn is a gas giant (hence, less mass but more volume). Infact, the density of Saturn is less than "1" which means that, if you can find a container filled with water large enough to place saturn in it, Saturn will float while Earth will sink!!

mrnood · Answer

@electrokid

the value of '1' which you quote is not strictly density (and you quoted no units)

The 'relative density' or (in older terms) 'specific gravity' of a substance is its density divided by the density of water.