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A balloon is a flexible bag normally filled with
a gas, such as helium, hydrogen, nitrous oxide or
air. Early balloons were made of dried animal bladders.
Modern balloons can be made from materials such
as rubber, latex, chloroprene or a nylon fabric.
Some balloons are purely decorative, while others
are used for specific purposes such as meteorology,
medical treatment, military defense, or transportation... |
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