Add Stefan-Boltzmann constant, closes #189

sharkdp · Oct 8, 2023 · 2748bd7 · 2748bd7
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diff --git a/book/src/list-constants.md b/book/src/list-constants.md
@@ -52,6 +52,7 @@ Colloquial:
 | Neutron mass | `neutron_mass` | `Mass` |
 | Avogadro constant | `avogadro_constant`, `N_A` | `1 / AmountOfSubstance` |
 | Boltzmann constant | `boltzmann_constant`, `k_B` | `Energy / Temperature` |
+| Stefan-Boltzmann constant | `stefan_boltzmann_constant` | `Power / (Area × Temperature^4)` |
 | Ideal gas constant | `gas_constant`, `R` | `Energy / (AmountOfSubstance × Temperature)` |
 | Planck length | `planck_length` | `Length` |
 | Planck mass | `planck_mass` | `Mass` |

diff --git a/numbat/modules/physics/constants.nbt b/numbat/modules/physics/constants.nbt
@@ -62,6 +62,9 @@ let N_A = avogadro_constant
 let boltzmann_constant: Energy / Temperature = 1.380649e-23 J / K
 let k_B = boltzmann_constant
 
+# Stefan-Boltzmann constant
+let stefan_boltzmann_constant: Power / (Area × Temperature^4) = 2 π^5 k_B^4 / (15 planck_constant^3 c^2)
+
 # Ideal gas constant
 let gas_constant: Energy / (AmountOfSubstance × Temperature) = 8.31446261815324 J / (K mol)
 let R = gas_constant