The balloon rises into decreasing outside air pressure but no air escapes to equalize inside pressure.
(The balloon; rises; into decreasing outside air pressure) (no air; escapes; to equalize inside pressure) Context(no air escapes,List([59, 73))):(no air; escapes to equalize; L:inside pressure)
no air escapes,List([59, 73))
The balloon no air no air
rises escapes escapes to equalize
into decreasing outside air pressure
to equalize inside pressure
L:inside pressure