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....

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Archimedes law

FA=ρf..Vf..g With: FA = Upward force (N), ρf = The density of the fluid(kg/m3), Vf = volume of the fluid displaced (m3), dan g = acceleration of gravity (m/s2).  It can be seen that the magnitude of the upward force experienced by objects in the fluid depends on the density of the fluid, the volume of displaced fluid, and the acceleration of Earth's gravity. You have to know that an object that is in the fluid may float, float, or sink,...

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