= Weak-coupling BCS thermodynamic ratios
{title2=$2\Delta(0)/(k_BT_c)=2\pi e^{-\gamma_E},\quad\Delta C/(\gamma_nT_c)=12/[7\zeta(3)]$}
The isotropic weak-coupling <BCS theory> predicts the gap ratio approximately $3.528$ and the electronic heat-capacity jump approximately $1.426$ in units of the normal-state <heat capacity> at the transition. These compare distinct measurements of the same paired state. They are conditional predictions of the weak-coupling fully gapped model, rather than universal numbers for all <superconductors>.
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