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Hot Air Balloon

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by

Vincent Tan

on 12 March 2013

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Transcript of Hot Air Balloon

by WeiSheng Tan Hot Air Balloon 220–280 AD - The early unmanned hot air
balloon, airborne lantern was invented by Zhuge Liang during the Three Kingdoms era for the purpose of military signaling. This lantern is also known as Kongming lantern. Airborne Lantern June 4, 1783 - The first demonstrated flight of
a hot air balloon took place in Annonay, France by the Montgolfier brothers. Sept 19, 1783 - Montgolfiere hot air balloon
carrying a sheep, a rooster, and a duck flew for eight minutes in Versailles. Oct 15, 1783 - Pilatre de Rozier became
the first human passengers on Montgolfiere balloon. Hydrogen Balloons by Jacques Charles Hot Air Balloons &Montgolfier Brothers Dec 1, 1783 - The first hydrogen hot air
balloon was invented by Frenchman, Jacques Charles. History How does it works? Basic Structure of Modern
Hot Air Balloon First Modern Hot Air Balloon 1967 - Briston Belle became the
first morden hot air balloon to be flown in Europe. The Envelope is a huge cloth
bag that is suspended over
the gondola and the burner. The Gondola is the basket at
the base of the envelope that
carries passengers and
supplies. The Burner rests on the top
of the gondola and
underneath the envelope. There are two basic principles Archimedes's Principle Pressure Buoyancy
Density Archimedes's Principle Any object suspended in a fluid is acted on by an upward buoyant force equal to the weight of the fluid displaced by object. Buoyancy Buoyant force is the force opposing the force of gravity and causing the balloon to lift off the ground.
It is an upward force pushing in on the balloon and causing it to rise. the center of buoyancy keeps the balloon stable.
Hence it must always be above the center of mass. Density is the ratio of mass to volume
When the air in the envelope is heated, it become less dense than the air outside of the envelope.
This is because molecules of cooler air are packed closer together than molecules of hot air.
The hotter and less dense air then will rise the envelope and the rest of the balloon. Pressure Pressure is force acted on the object per unit area.
The area of the balloon with the greatest amount of pressure pushing in on it is the area near the bottom since it is deeper in the fluid(air).
The greater pressure towards the bottom of the balloon as opposed to the top of the balloon is what causes the force to be upward.
The greatest amount of force is on the bottom of the balloon pushing up, so the net force would be pushing the balloon up. THE END Conclusion Hot air balloon is the oldest successful human-carrying flight technology.
Although this technology had been replaced by airplane, hot air balloon still remained popular in some country.
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