Hot Air Balloon

With Hot Air Balloon exhibit, visitors press a button to heat the air inside the balloon, when the air is at about 90°C, they press another button and the balloon rises majestically into the air and comes down again when the air has cooled. The amount of lift provided by a hot air balloon depends primarily upon the difference between the temperature of the air inside the balloon and the temperature of the air outside the balloon. When raising the air temperature inside the balloon, the volume expands and the balloon is made lighter than the surrounding air. As a result, the balloon and its payload is forced into the air.