From Simple English Wikipedia, the free encyclopedia
A
balloon
is a kind of
aircraft
that stays in the sky by
floating
. People fly in balloons mostly for fun.
A balloon is different from an
airship
. An airship is a floating aircraft that has an engine and can change its direction of movement. A balloon has no engine and has no way to change its direction of movement (except up and down). A balloon travels by moving with the
wind
.
The bottom of the balloon is called the "basket" where people can sit or stand.
The top of a balloon is a big cloth bag called the "envelope".
There are three kinds of balloon aircraft:
- Hot air balloons
stay in the sky by making the air inside the envelope hot. Making the air hot makes the air spread out (have lower
density
). Hot air balloons are the most common kind of balloon aircraft. People sometimes say "hot air balloon" to mean any kind of balloon aircraft. But this is not exactly correct.
- Gas balloons
are not hot. Gas balloons have
gas
of low
density
in their envelopes. Examples of the gas used in gas balloons are
helium
and
hydrogen
.
- Roziere balloons
are like both hot air balloons and gas balloons. Part of the envelope has hot air in it. Part of the envelope has a gas that's not hot in it. Roziere balloons can fly very far. Roziere balloons have flown around the world without stopping.
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Types of aircraft
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Famous aircraft
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