Electronmass with UnitSystems

[chakravala]

I recommend using UnitSystems to get the most consistent physical constants available:

julia> using UnitSystems

julia> electronmass(Metric)
9.109383701558256e-31

julia> protonmass(Metric)
1.6726219236940502e-27

julia> mₑ
9.109383701558256e-31

julia> μₚₑ
1836.152673432705

Or alternatively, if you also want Quantity metadata, using Similitude

julia> using Similitude

julia> electronmass(Metric)
𝘩⋅𝘤⁻¹R∞⋅α⁻²2 = 9.109383701558251e-31 [kg] Metric

julia> protonmass(Metric)
𝘩⋅𝘤⁻¹R∞⋅α⁻²μₑᵤ⁻¹μₚᵤ⋅2 = 1.6726219236940495e-27 [kg] Metric

However, UnitSystems is a much more lightweight due to only relying on Float64 algebra instead of abstract Group algebra.

[jwscook]

Thanks, this would be an improvement. I was aware of Unitful.jl, which is a bit bloaty imo, but I didn't know about this one.