Compare packages on age and activity. Add lists of constants.

Author: tp2750

docs/comparisons/physics/physical_constants.md

@@ -16,31 +16,72 @@ Several packages collect physical constants.
 ### PhysicalConstants.jl
 {{badge PhysicalConstants}}
 
-Collection of fundamental physical constants with uncertainties. It supports arbitrary-precision constants.
+>Collection of fundamental physical constants with uncertainties. It supports arbitrary-precision constants.
 
 This is part of the [JuliaPhysics](https://github.com/JuliaPhysics) organization.
+It contains data from 3 datasets (2025-07-15) each as it's own submodule: `PhysicalConstants.CODATA2014`, `PhysicalConstants.CODATA2018`, `PhysicalConstants.CODATA2022`.
+
+List of constants 24: [CODATA2022](https://juliaphysics.github.io/PhysicalConstants.jl/dev/constants/).
+
+
+| Long name                             | Short | Value                  | Unit           |
+|---------------------------------------|-------|------------------------|----------------|
+| AtomicMassConstant                    | m_u   | 1.66053906892e-27      | kg             |
+| AvogadroConstant                      | N_A   | 6.02214076e23          | mol^-1         |
+| BohrMagneton                          | μ_B   | 9.2740100657e-24       | J T^-1         |
+| BohrRadius                            | a_0   | 5.29177210544e-11      |                |
+| BoltzmannConstant                     | k_B   | 1.380649e-23           | J K^-1         |
+| CharacteristicImpedanceOfVacuum       | Z_0   | 376.730313412          |                |
+| ElectronMass                          | m_e   | 9.1093837139e-31       | kg             |
+| ElementaryCharge                      | e     | 1.602176634e-19        |                |
+| FineStructureConstant                 | α     | 0.0072973525643        |                |
+| MolarGasConstant                      | R     | 8.31446261815324       | J K^-1 mol^-1  |
+| NeutronMass                           | m_n   | 1.67492750056e-27      | kg             |
+| NewtonianConstantOfGravitation        | G     | 6.6743e-11             | m^3 kg^-1 s^-2 |
+| PlanckConstant                        | h     | 6.62607015e-34         | J s            |
+| ProtonMass                            | m_p   | 1.67262192595e-27      | kg             |
+| ReducedPlanckConstant                 | ħ     | 1.0545718176461565e-34 | J s            |
+| RydbergConstant                       | R_∞   | 1.0973731568157e7      | m^-1           |
+| SpeedOfLightInVacuum                  | c_0   | 2.99792458e8           | m s^-1         |
+| StandardAccelerationOfGravitation     | g_n   | 9.80665                | m s^-2         |
+| StandardAtmosphere                    | atm   | 101325.0               | Pa             |
+| StefanBoltzmannConstant               | σ     | 5.6703744191844294e-8  | W K^-4 m^-2    |
+| ThomsonCrossSection                   | σ_e   | 6.6524587051e-29       | m^2            |
+| VacuumElectricPermittivity            | ε_0   | 8.8541878188e-12       | F m^-1         |
+| VacuumMagneticPermeability            | μ_0   | 1.25663706127e-6       | N A^-2         |
+| WienFrequencyDisplacementLawConstant  | b′    | 5.878925757646825e10   | Hz K^-1        |
+| WienWavelengthDisplacementLawConstant | b     | 0.0028977719551851727  | K m            |
+
+[PhysicalConstants.jl](https://juliaphysics.github.io/PhysicalConstants.jl) was started in 2018 by [giordano](https://github.com/giordano). He is still the main contributor with a few commits by 6 other developers (2025-07-15).
 
 ### PeriodicTable.jl
 {{badge PeriodicTable}}
 
-Periodic Table for Julians! 🔥 
+>Periodic Table for Julians! 🔥 
 
 This is part of the [JuliaPhysics](https://github.com/JuliaPhysics) organization.
 
+[PeriodicTable.jl](https://github.com/JuliaPhysics/PeriodicTable.jl) was started in 2018 by [rahulkp220](https://github.com/rahulkp220). Since then, it has mainly been maintained by [carstenbauer](https://github.com/carstenbauer) with contributions from 9 others (2025-07-15).
+
 ### Mendeleev.jl
 {{badge Mendeleev}}
 
-A Julia package for accessing chemical elements data. 
+>A Julia package for accessing chemical elements data. 
+
+[Mendeleev.jl](https://github.com/Eben60/Mendeleev.jl) was started in 2022 by [Eben60](https://github.com/Eben60) who is also the top 3 contributor to [PeriodicTable.jl](https://github.com/JuliaPhysics/PeriodicTable.jl). It has only had few updates since 2022 and not by others  (2025-07-15).
+
 
 ### IsotopeTable.jl
 {{badge IsotopeTable}}
 
-Table of Isotopes for Julians. Interoperable with `PeriodicTable.jl` 
+>Table of Isotopes for Julians. Interoperable with `PeriodicTable.jl` 
+
+[IsotopeTable.jl](https://github.com/Gregstrq/IsotopeTable.jl) was started in 2022 by [Gregstrq](https://github.com/Gregstrq) and has not been updated since (2025-07-15).
 
 ### Unitful.jl
 {{badge Unitful}}
 
-The [Unitful.jl](https://github.com/PainterQubits/Unitful.jl) package also contains a number of physical constants in [this section](https://painterqubits.github.io/Unitful.jl/dev/defaultunits/#Physical-constants):
+The [Unitful.jl](https://github.com/PainterQubits/Unitful.jl) package also contains 19 physical constants in [this section](https://painterqubits.github.io/Unitful.jl/dev/defaultunits/#Physical-constants):
 
 | Const | Value                              | Description                           |
 |-------|------------------------------------|---------------------------------------|
@@ -55,7 +96,7 @@ The [Unitful.jl](https://github.com/PainterQubits/Unitful.jl) package also conta
 | k     | 1.380,649 × 10^-23 J / K           | Boltzmann constant                    |
 | me    | 9.109,383,7015 × 10^-31 kg         | rest mass of an electron              |
 | mn    | 1.674,927,498,04 × 10^-27 kg       | rest mass of a neutron                |
-| mp    | 1.672,621,923,69 × 10^-27 kg       | rest mass of a proton,                |
+| mp    | 1.672,621,923,69 × 10^-27 kg       | rest mass of a proton                 |
 | q     | 1.602,176,634 × 10^-19 C           | charge of a single electron           |
 | ħ     | h / 2π.                            | reduced Planck constant               |
 | Φ0    | h / (2 × q)                        | superconducting magnetic flux quantum |
@@ -64,7 +105,20 @@ The [Unitful.jl](https://github.com/PainterQubits/Unitful.jl) package also conta
 | μB    | q × ħ / (2 × me)                   | Bohr magneton                         |
 | σ     | π^2 × k^4 / (60 × ħ^3 × c^2)       | Stefan-Boltzmann constant             |
 
+Those from [PhysicalConstants.jl](https://juliaphysics.github.io/PhysicalConstants.jl) that are missing here are:
+
+* Bohr Radius
+* Standard atmospheric pressure
+* Fine Structure Constant
+* Thomson Cross Section
+* Wien Frequency Displacement Law Constant
+* Wien Wavelength Displacement Law Constant
+
+The unique one here is:
+* Superconducting magnetic flux quantum
 
+[Unitful.jl](https://github.com/PainterQubits/Unitful.jl) was started in 2016 by [ajkeller34](https://github.com/ajkeller34). 
+It is currently mainly maintained by [sostock](https://github.com/sostock) and has contributions from 76 developers (2025).
 
 ## Star History
 {{star_history PhysicalConstants PeriodicTable Mendeleev IsotopeTable Unitful}}