When And For What Purpose Was The Hot-air Balloon Invented?

When And For What Purpose Was The Hot-air Balloon Invented? The French brothers Joseph-Michel and Jacques-Étienne Montgolfier developed a hot-air balloon in Annonay, Ardeche, France, and demonstrated it publicly on September 19, 1783, making an unmanned flight lasting 10 minutes. What was the purpose of hot-air balloon? Hot-air balloons are commonly used for recreational purposes.