A hot air balloon does not have a combustion engine and a propeller like an airplane, yet it can fly. A hot Air balloon consists of a huge nylon balloon, A hot air engine, and a large basket. The hot air engine fills the balloon with hot air.
Hot air rises, and once the balloon is filled with hot air, it rises as well.
A valve in the engine controls the amount of hot air allowed into the nylon balloon. When the balloon s pilot wants the balloon to soar higher, he opens the valve and lets in more hot air. When he wants the hot air balloon to descend, he closes the valve. The students will demonstrate their knowledge of hot air balloon s by making a miniature hot air balloon out of K nex toys. The students will explain how and why a hot air balloon works.