(all figures approximate)
Mass of earth = 5.97 * 1024 kilograms
Radius of earth = 6.371 * 106 metres
Volume of earth = 4/3 * pi * radius3 = 1.0832 * 1021 cu metres
So:
(average) density = mass / volume = 5,510 kgs / cu metre
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By dividing the mass by the volume.
Density = mass / volume since earth is nearly spherical, Volume = (4/3)pi x r3 find volume, then divide this into the mass.
Density = Mass/Volume so Mass = Density*Volume.
mass= density*volume
density = mass/volume If you know density and mass, you can calculate the volume by manipulating the density equation such that volume = mass/density. Example: density = 3.57g/cm3 mass = 2.4g volume = ? volume = mass/density = 2.4g/3.57g/cm3 = 0.67cm3