For intermediate pH res values, theory and simulations differ the most. We observe a more abrupt swelling with an earlier saturation in the theory, in contrast to the more gradual swelling with increasing pH res in the simulations. The slower swelling in the simulations is a result of (1) the correlations that shift the ionization degree and (2) the condensation effects due to the chain-like charge distribution. At constant pH res for varying N , we see that the relative swelling is larger for microgels with larger N . This observation can be explained as a consequence of scaling. In Fig. , we plot the microgel radius of gyration, R g , versus N for different values of pH res . We observe that R g follows the expected scaling laws according to the ionization degree. At low pH res , microgel are predominantly neutral and R g ∝ N 0.6 , which corresponds to the swelling of a neutral gel with segments with excluded volume. At larger pH res , pH res ≈ 9.5 for example, where the microgel is fully ionized, R g ∝ N , which corresponds to the scaling of charged chains. Thus, the relative swelling in the highly charged state scales approximately as ∝ N 0.4 , leading to a more pronounced swelling for longer chains.