Before the (INVENT) of the hot air balloon, no human had ever successfully flown above the ground. Two (FRANCE) brothers, Josef and Etienne Montgolfier, were responsible for designing the world's first hot air balloon. The first successful (FLY) was in 1783, and the Montgolfier brothers immediately became (FAME) throughout the world. The design of hot air balloons is based on the (SCIENCE) law that hot air rises. A burner at the bottom of the balloon provides the (HOT). As the air inside the balloon gets hotter, the balloon takes off. Its height above the ground is determined by how hot the air inside is and its (DIRECT) of travel depends on the wind.