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Balloons : a nonporous bag of light material that can be
inflated especially
with air or gas. A bag that is filled with heated air or a
gas lighter than air
so as to rise and float in the ... atmosphere and that usually
carries a suspended
load (as a gondola with passengers).

Rockets: A jet engine that operates on the same principle
as the firework
rocket, consists essentially of a combustion chamber and an
exhaust nozzle,
carries either liquid or solid propellants which provide the
fuel and oxygen
needed for combustion and thus make the engine independent
of the oxygen of the
air, and is used especially for the propulsion of a missile
(as a bomb or shell)
or a vehicle (as an airplane). A rocket-propelled bomb,
missile, projectile, or
vehicle.