Which factor increases as a result of increasing altitude? air pressure, air density, height of sea level or space between gas molecules

space between gas molecules

Explanation:

as the altitude increases the air density decrease because of weaker gravity and these led to more distant of air molecule  and the space between gas is increased

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.