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Merge pull request #107 from tp2750/constants_2025-07-13
Add section on physical constants.
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‎docs/comparisons/physics/physical_constants.md

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title = "Physical Constants"
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# Physical Constants
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\toc
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## Overview
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Several packages collect physical constants.
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## Packages
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### PhysicalConstants.jl
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{{badge PhysicalConstants}}
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>Collection of fundamental physical constants with uncertainties. It supports arbitrary-precision constants.
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This is part of the [JuliaPhysics](https://github.com/JuliaPhysics) organization.
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It contains data from 3 datasets[^1] each as it's own submodule: `PhysicalConstants.CODATA2014`, `PhysicalConstants.CODATA2018`, `PhysicalConstants.CODATA2022`.
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List of constants 24: [CODATA2022](https://juliaphysics.github.io/PhysicalConstants.jl/dev/constants/).
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| Long name | Short | Value | Unit |
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|---------------------------------------|-------|------------------------|----------------|
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| AtomicMassConstant | m_u | 1.66053906892e-27 | kg |
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| AvogadroConstant | N_A | 6.02214076e23 | mol^-1 |
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| BohrMagneton | μ_B | 9.2740100657e-24 | J T^-1 |
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| BohrRadius | a_0 | 5.29177210544e-11 | |
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| BoltzmannConstant | k_B | 1.380649e-23 | J K^-1 |
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| CharacteristicImpedanceOfVacuum | Z_0 | 376.730313412 | |
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| ElectronMass | m_e | 9.1093837139e-31 | kg |
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| ElementaryCharge | e | 1.602176634e-19 | |
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| FineStructureConstant | α | 0.0072973525643 | |
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| MolarGasConstant | R | 8.31446261815324 | J K^-1 mol^-1 |
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| NeutronMass | m_n | 1.67492750056e-27 | kg |
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| NewtonianConstantOfGravitation | G | 6.6743e-11 | m^3 kg^-1 s^-2 |
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| PlanckConstant | h | 6.62607015e-34 | J s |
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| ProtonMass | m_p | 1.67262192595e-27 | kg |
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| ReducedPlanckConstant | ħ | 1.0545718176461565e-34 | J s |
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| RydbergConstant | R_∞ | 1.0973731568157e7 | m^-1 |
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| SpeedOfLightInVacuum | c_0 | 2.99792458e8 | m s^-1 |
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| StandardAccelerationOfGravitation | g_n | 9.80665 | m s^-2 |
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| StandardAtmosphere | atm | 101325.0 | Pa |
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| StefanBoltzmannConstant | σ | 5.6703744191844294e-8 | W K^-4 m^-2 |
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| ThomsonCrossSection | σ_e | 6.6524587051e-29 | m^2 |
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| VacuumElectricPermittivity | ε_0 | 8.8541878188e-12 | F m^-1 |
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| VacuumMagneticPermeability | μ_0 | 1.25663706127e-6 | N A^-2 |
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| WienFrequencyDisplacementLawConstant | b′ | 5.878925757646825e10 | Hz K^-1 |
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| WienWavelengthDisplacementLawConstant | b | 0.0028977719551851727 | K m |
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[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[^1].
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### PeriodicTable.jl
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{{badge PeriodicTable}}
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>Periodic Table for Julians! 🔥
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This is part of the [JuliaPhysics](https://github.com/JuliaPhysics) organization.
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Use this i fyou just need standard data on elements: name, appearance, atomic_mass, boil, category, color, density, discovered_by, melt, molar_heat, named_by, number, period, phase, source, spectral_img, summary, symbol, xpos, ypos, shells.
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[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[^1].
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### Mendeleev.jl
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{{badge Mendeleev}}
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>A Julia package for accessing chemical elements data.
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This contains (almost) all the same data as [PeriodicTable.jl](https://github.com/JuliaPhysics/PeriodicTable.jl) plus some more: <https://eben60.github.io/Mendeleev.jl/elements_data_fields/>.
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Use this if you need more data on the elements.
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[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[^1].
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### IsotopeTable.jl
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{{badge IsotopeTable}}
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>Table of Isotopes for Julians. Interoperable with `PeriodicTable.jl`
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[IsotopeTable.jl](https://github.com/Gregstrq/IsotopeTable.jl) was done in 2022 by [Gregstrq](https://github.com/Gregstrq)[^1]. Use this if you need more precise isotope data.
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### Unitful.jl
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{{badge Unitful}}
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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):
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| Const | Value | Description |
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|-------|------------------------------------|---------------------------------------|
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| G | 6.674,30 × 10^-11 m^3 / (kg × s^2) | universal gravitational constant |
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| Na | 6.022,140,76 × 10^23 / mol. | Avogadro's constant |
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| R | Na × k | the molar gas constant, |
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| R∞ | 1.097,373,156,8160 × 10^-7 / m | Rydberg constant, |
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| Z0 | μ0 × c | impedance of free space |
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| c0 | 2.997,924,58 × 10^8 m/s | speed of light in a vacuum |
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| gn | 9.806,65 m / s^2 | nominal acceleration due to gravity |
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| h | 6.626,070,15 × 10^-34 J × s | Planck's constant |
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| k | 1.380,649 × 10^-23 J / K | Boltzmann constant |
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| me | 9.109,383,7015 × 10^-31 kg | rest mass of an electron |
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| mn | 1.674,927,498,04 × 10^-27 kg | rest mass of a neutron |
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| mp | 1.672,621,923,69 × 10^-27 kg | rest mass of a proton |
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| q | 1.602,176,634 × 10^-19 C | charge of a single electron |
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| ħ | h / 2π. | reduced Planck constant |
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| Φ0 | h / (2 × q) | superconducting magnetic flux quantum |
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| ε0 ϵ0 | 1 / (μ0 × c^2) | vacuum permittivity constant |
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| μ0 | 4π × 10^-7 H / m | vacuum permeability constant |
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| μB | q × ħ / (2 × me) | Bohr magneton |
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| σ | π^2 × k^4 / (60 × ħ^3 × c^2) | Stefan-Boltzmann constant |
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Those from [PhysicalConstants.jl](https://juliaphysics.github.io/PhysicalConstants.jl) that are missing here are:
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* Bohr Radius
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* Standard atmospheric pressure
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* Fine Structure Constant
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* Thomson Cross Section
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* Wien Frequency Displacement Law Constant
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* Wien Wavelength Displacement Law Constant
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The unique one here is:
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* Superconducting magnetic flux quantum
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[Unitful.jl](https://github.com/PainterQubits/Unitful.jl) was started in 2016 by [ajkeller34](https://github.com/ajkeller34).
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It is currently mainly maintained by [sostock](https://github.com/sostock) and has contributions from 76 developers[^1].
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## Star History
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{{star_history PhysicalConstants PeriodicTable Mendeleev IsotopeTable Unitful}}
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[^1]: By 2025-07-15.

‎docs/utils.jl

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PkgInfo(pkgname="JDF", username="xiaodaigh", docslink=nothing),
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PkgInfo(pkgname="Serde", username="bhftbootcamp", branch="master"),
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# PkgInfo(pkgname="LopShelve", username="machkouroke", docslink="https://lopuniverse.me/LopShelve.jl/"),
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PkgInfo(pkgname="PeriodicTable", username="JuliaPhysics", branch="master", docslink=nothing),
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PkgInfo(pkgname="PhysicalConstants", username="JuliaPhysics", branch="master"),
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PkgInfo(pkgname="Mendeleev", username="Eben60", branch="main", docslink="https://eben60.github.io/Mendeleev.jl/"),
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PkgInfo(pkgname="IsotopeTable", username="Gregstrq", branch="main", docslink=nothing),
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]
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function get_pkginfo(pkgname)
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brace_content = Franklin.content(com.braces[1]) # input string
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# do whatever you want here
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return uppercase(brace_content)
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end
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end

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