Thermoelectric couple figure of merit
= Thermoelectric couple figure of merit
{title2=$Z_{\rm pair}$}
For a constant-property pair with Seebeck difference $\alpha_{np}$, electrical resistance $R$ and thermal conductance $K$, $Z_{\rm pair}=\alpha_{np}^2/(RK)$. With identical legs of individual resistivity $\rho$ and thermal conductivity $\kappa$, this is $\alpha_{np}^2/(4\rho\kappa)$, not $\alpha_{np}^2/(\rho\kappa)$.