A balloon is a flexible bag normally filled with a gas, such as helium, hydrogen, nitrous oxide or air. Some balloons are purely decorative, others are used for specific purposes. Early balloons were made of dried animal bladders. Modern balloons can be made from materials such as rubber, latex, chloroprene or a nylon fabric. A balloon's unique properties including its low density and relatively low cost have lead to a wide range of applications.
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