Calcolatore Densita Barionica
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Baryon Density Parameter
0.044351
Baryon Density Parameter vs Baryon Density
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.
Esempio Risolto
rho_b = 4.2e-28 kg/m³, rho_crit = 9.47e-27 kg/m³.
- 01Omega_b = rho_b / rho_crit
- 02Omega_b = 4.2e-28 / 9.47e-27
- 03Omega_b ≈ 0.0443
- 04As a percentage: 4.43%
Domande Frequenti
What counts as baryonic matter?
All matter made of protons and neutrons: stars, planets, gas, dust, and diffuse intergalactic plasma. Electrons are included by convention.
Where is most of the baryonic matter?
Most is in the warm-hot intergalactic medium (WHIM) between galaxies. Only a small fraction is in stars and planets.
How is Omega_b measured?
Primarily from Big Bang nucleosynthesis abundances (deuterium, helium) and the acoustic peaks of the cosmic microwave background.