The ideal gas law and KMT are not perfect representations of how gases behave.

In reality, gases do experience IMFs and gravity, and they do not have perfectly elastic collisions.

Gases behave more ideally at high temperatures and low pressure.

Gases with stronger IMFs or gases near their boiling point behave less ideally.

The pressure value will exceed what is predicted by the ideal gas law because it does not consider molecular volume.

Lower pressure than would be predicted because the ideal gas law does not consider IMFs.