Ballooning was the first successful means of flight, even before the plane or gliders. A hot air balloon in France, 1783, was the pioneer for new means of transportation. Hot air balloons are the oldest, successful flight technology, and its flight relies on Archimedes’ principle of buoyancy and Ideal Gas Laws. Air inside the balloon is heated, causing gas molecules to disperse and achieve a lower average density. The density gradient of air inside the balloon and air outside allows resultant buoyancy, as long as the density of air trapped in balloon is lower than that of surrounding air the balloon can stay aloft. The heating to achieve lower density in the trapped air of the balloon is done through the use of fuels, with the most common being propane fuels. Propane is preferred over other hydrocarbons because its low boiling point allows a consistently higher vapour pressure for a given temperature, and is therefore a more efficient fuel.