Calculateur de Densité Planétaire — Formule
## Mean Bulk Density of a Planet
The average density is found by dividing the total mass by the total volume.
### Formula
**rho = M / V = 3M / (4 pi R cubed)**
Density helps distinguish rocky planets (about 5 g/cm3) from gas giants (about 1 g/cm3). Earth's mean density is about 5.51 g/cm3.
The average density is found by dividing the total mass by the total volume.
### Formula
**rho = M / V = 3M / (4 pi R cubed)**
Density helps distinguish rocky planets (about 5 g/cm3) from gas giants (about 1 g/cm3). Earth's mean density is about 5.51 g/cm3.
Exemple Résolu
Earth: M = 5.972e24 kg, R = 6.371e6 m.
- rho = 3M / (4 pi R cubed)
- R cubed = (6.371e6)^3 = 2.586e20
- 4 pi R cubed = 3.254e21
- rho = 3 * 5.972e24 / 3.254e21
- rho = 5 504 kg/m3 = 5.50 g/cm3