Phase ordering at T < T_c — domain walls coarsen as L(t) ~ t^(1/2)
Each spin flip attempt: P(flip) = 1/(1+exp(2ΔE/T)). Below T_c (T_c≈2.27J), ordered domains grow. Domain size obeys L(t) ~ t^½ (model A, non-conserved order parameter). The dynamics conserves nothing — it is purely relaxational toward equilibrium.