# Jarzynski equality

The Jarzynski equality is also known as the work relation or non-equilibrium work relation. According to it, the equilibrium free energy of a process, $\Delta G$, can be reconstructed by averaging the external work, $W$, performed in many nonequilibrium realizations of the process:
$\exp \left( \frac{-\Delta G}{k_BT}\right)= \left\langle \exp \left( \frac{-W}{k_BT} \right) \right\rangle$