Hot air balloon Astronaut a talented physicist

a talented physicist

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Hot air balloon Astronaut a talented physicistA hot air balloon is a lighter than air aircraft that consists of a bag, called an envelope, which contains heated air. Suspended beneath is a gondola or wicker basket, which carries passengers and a source of heat, in most cases an open flame caused by burning liquid propane. The envelope is made of a lightweight material, such as nylon or polyester, and is coated with a sealant to prevent the hot air from escaping.