A hot-air balloon is a lighter-than-air aircraft consisting of a bag, called an envelope, which contains heated air. We do the tag Hot Ballooning. Hot air ballooning entails the pilot riding inside a wicker basket attached to a huge balloon made of rip-stop nylon. The balloon has a burner which is positioned between the wicker basket and the balloon. The flame of the burner heats the air inside the balloon and makes it rise. The degree to which the balloon air is heated depends on the atmospheric conditions, also on how high the pilot wants the balloon to go, and, of course, the fuel.