Balloonomania their ballooning stunts, with Blanchard and his companion Dr. John Jeffries being the first to cross the English channel in a balloon on January 7, 1785. The public reaction among intellectuals and academics was generally cooler, with some critics of balloonomania including the likes of Sir Joseph Banks and Samuel Johnson, who wrote in a 1783 letter to Hester Thrale, who had inquired about the nature of hot air balloons, “Happy are you, Madam, that have ease and leisure to want intelligence of air balloons. Their existence is, I believe, indubitable, but I know not that they can possibly be
Hot air balloon indicators would be useless) and direction. The combined mass of an average system can be calculated as follows: using a density of 0.9486 kg/m³ for dry air heated to 210 °F (99 °C). Increasing the air temperature inside the envelope makes it less dense than the surrounding (ambient) air. The balloon floats because of the buoyant force exerted on it. This force is the same force that acts on objects when they are in water and is described by Archimedes' principle. The amount of lift (or buoyancy) provided by a hot air balloon depends primarily upon the difference between the