Question. There is an experiment investigating how a gas's occupying volume changes when its exerting pressure alters. As a result, a graph of pressure versus volume has been plotted, which is half of a reciprocal graph (like the bottom half of the capital letter C). Then the question comes: how would the graph change if the gas type changes from air molecules (say nitrogen gas) to hydrogen gas?
My Attempt. My thinking is that nitrogen has a larger atomic mass than hydrogen, so the latter would occupy less space. Consequently, I argue that the new graph would be relatively shifted to the left, i.e. a same pressure would now corresponds to a less volume.
Comment. The given answer in book is "no change" which confused me. Thanks for any help in advance!