What's air balloon

Hot air balloon flight is the first by human technology, invented by the Montgolfier brothers in Annonay, France in 1783. The first flight by man was held on 21 November 1783, in Paris by Pilatre de Rozier and the Marquis d'Arlandes. Hot air balloon can be controlled and not only brought winds known as airships or thermal airship.
Hot air balloons give lift force due to the hot air inside the balloon is lighter than the air outside the balloon. Air balloon works is based on the principle of Archimedes Law. According to this principle, it can be stated that a body that surrounded the air will experience a lift force equal to the volume of air displaced by the object.