They would try to get 'above' the air.
If gravity were pulling air upwards, the balloon would go to the ground I think.
It's a silly question really.
(
supermoore: HUNG,
Fri 18 Jun 2004, 15:29,
archived)
no
cos the air would've fucktoff
(
Oscar Wildebeest,
Sat 19 Jun 2004, 12:58,
archived)