Baryon Density Calculator — Formula
## Baryon Density Parameter
Ordinary (baryonic) matter—protons, neutrons, electrons—makes up only a small fraction of the universe.
### Formula
**Omega_b = rho_b / rho_crit**
Current measurements give Omega_b about 0.049, meaning only roughly 5% of the total energy budget is ordinary matter.
Ordinary (baryonic) matter—protons, neutrons, electrons—makes up only a small fraction of the universe.
### Formula
**Omega_b = rho_b / rho_crit**
Current measurements give Omega_b about 0.049, meaning only roughly 5% of the total energy budget is ordinary matter.
Esempio Risolto
rho_b = 4.2e-28 kg/m³, rho_crit = 9.47e-27 kg/m³.
- Omega_b = rho_b / rho_crit
- Omega_b = 4.2e-28 / 9.47e-27
- Omega_b ≈ 0.0443
- As a percentage: 4.43%