\Section{constants}
    \desc{Constants}{}{}
    \desc[german]{Konstanten}{}{}

    \begin{formula}{planck}
        \desc{Planck Constant}{}{}
        \desc[german]{Plancksches Wirkumsquantum}{}{}
        \constant{h}{def}{
            \val{6.62607015\cdot 10^{-34}}{\joule\s}
            \val{4.135667969\dots\xE{-15}}{\eV\s}
        }
    \end{formula}

    \begin{formula}{universal_gas}
        \desc{Universal gas constant}{Proportionality factor for ideal gases}{\ConstRef{avogadro}, \ConstRef{boltzmann}}
        \desc[german]{Universelle Gaskonstante}{Proportionalitätskonstante für ideale Gase}{}
        \constant{R}{def}{
            \val{8.31446261815324}{\joule\per\mol\kelvin}
            \val{\NA \cdot \kB}{}
        }
    \end{formula}

    \begin{formula}{avogadro}
        \desc{Avogadro constant}{Number of molecules per mole}{}
        \desc[german]{Avogadro-Konstante}{Anzahl der Moleküle pro mol}{}
        \constant{\NA}{def}{
            \val{6.02214076 \xE{23}}{1\per\mole}
        }
    \end{formula}

    \begin{formula}{boltzmann}
        \desc{Boltzmann constant}{Temperature-Energy conversion factor}{}
        \desc[german]{Boltzmann-Konstante}{Temperatur-Energie Umrechnungsfaktor}{}
        \constant{\kB}{def}{
            \val{1.380649 \xE{-23}}{\joule\per\kelvin}
        }
    \end{formula}

    \begin{formula}{faraday}
        \desc{Faraday constant}{Electric charge of one mol of single-charged ions}{\ConstRef{avogadro}, \ConstRef{charge}}
        \desc[german]{Faraday-Konstante}{Elektrische Ladungs von einem Mol einfach geladener Ionen}{}
        \constant{F}{def}{
            \val{9.64853321233100184\xE{4}}{\coulomb\per\mol}
            \val{\NA\,e}{}
        }
    \end{formula}

    \begin{formula}{charge}
        \desc{Unit charge}{}{}
        \desc[german]{Elementarladung}{}{}
        \constant{e}{def}{
            \val{1.602176634\xE{-19}}{\coulomb}
        }
    \end{formula}

    \begin{formula}{flux_quantum}
        \desc{Flux quantum}{}{}
        \desc[german]{Flussquantum}{}{}
        \constant{\Phi_0}{def}{
            \val{2.067 833 848 \xE{-15}}{\weber=\volt\s=\kg\m^2\per\s^2\ampere}
        }
        \eq{\Phi_0 = \frac{h}{2e}}
    \end{formula}

    \begin{formula}{atomic_mass_unit}
        \desc{Atomic mass unit}{}{}
        \desc[german]{Atomare Massneinheit}{}{}
        \constant{u}{exp}{
            \val{1.66053906892(52)\xE{-27}}{\kg}
        }
    \end{formula}