Model error could also be improved by incorporating physical constraints, such as requiring zero uptake at zero pressure. Given that both experimental and modeling results will inherently have some error, we find the ethane uptake results to be in reasonable agreement with each other in the industrially relevant pressure regime near 101 kPa. on pure components at 298 K and varying pressure in a 3x3x3 simulation cell. We used the UFF forcefield for the framework and TraPPE-UA 83 for the adsorbates. We used 25,000 equilibration steps followed by 50,000 simulation steps and a 12.8 Å cutoff for Lennard-Jones interactions. Adsorbates were modeled as identical, spherical pseudo-molecules.