Buoyancy

The time passed and people thought to solve the problem of flight by using Buoyancy, based on the studies of Archimedes of Syracuse, greek mathematician and physicist, who lived in the third century BC that enunciated in his work "About Floating Bodies". Shortly, this principle states: "any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object". The most interesting thing is that this principle can be applied to both liquids and gases and it involved the development of the balloon first and then the airship.