Question about machine that runs on the road.

[Natstrackalpha]

In thanks for your non aviation input here is a list of stuff you already know.

Warm Air is less dense than cold air.

Dry Air is more dense than moist air.(Weird but true - the reason being that the molocules of air cause a displacement and take up the place of the . . air molocules, a bit like having a giant aquarium with a heavy model boat floating on the top.
Now, from a pipe with holes in the bottom of the aquarium, pump air into the pipe to cover the surface with air bubble, ship sinks.
Same principle as above, except now we are using air in water instead of water in the air).

But that provides the question: "Why don`t the air molocules - in the air - also provide lift . . ? . . or make the air denser by their mere prescence?

I know, I know - " I must get a life"