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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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Note: Both the topic and the answer were created by one of our users.
The diagram illustrates the working of a hot air balloon.
Overall, it can be clearly seen that the largest part is the envelope, while propane is the main source for making hot air.
At first, cool air keeps the balloon heavy and stays on the ground. There are several parts below the envelope. Inside the basket, there are two propane cylinders as substances needed for mixture with air to produce flame. Through the burner above, fires are made, bringing the hot air that makes the balloon lighter. These parts are connected with the envelope by ropes and a skirt.
The whole envelope is made from three main parts. There are multiple gores and a line of panels joint to form a light bulb-like shape of the envelope. In the top of the balloon, a parachute valve is designed as a self-sealing flap used for controlling the amount of hot air escapes, which later decides the speed and the height of the air balloon.
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