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The image shows a labeled diagram of a hot air balloon with two sections: left section is a full labeled diagram of a hot air balloon; the right section explains the mechanism of how hot air and cool air work with arrows. The left diagram labels, from top to bottom, are Parachute valve, Goers, Envelope, Panels, Skirt, Burner, Rope, Basket, and Propane cylinder. The right section contains two balloons showing the different states of air inside, labeled Hot air (light) at the top and Cool air (heavy) at the bottom, with an explanatory note stating "mix propane with air to produce flame to make hot air." The arrow indicates the upward movement of the hot air.
Given the complexity of the image, the above description may not be entirely accurate.
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The diagram demonstrates the structural features and operation of a hot balloon.
Overall, it is obvious that a hot air balloon involves several crucial parts such as the envelope, the skirt, the burner and the basket where people sit. Furthermore, in order to run a hot balloon, heating air is very necessary.
Regarding the balloon construction, the biggest part is the envelope, which consists of multiple vertical gores made from many small horizontal panels. On the top of the envelope, there is a parachute valve which is used as a self-sealing flap to allow hot air escape at a controlled pace. Under the envelope is the skirt connecting with the rope to hold a basket below it and a burner including propane cylinder is fixed above the basket.
When it comes to the operation, hot air is produced by mixing propane with air in the cylinder. At that time, the heated air is lighter than the cool air outside, which makes the balloon lifts the basket and buoyant.
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