Hot air balloon sea level, and humidity of the air surrounding. On a warm day, a balloon cannot lift as much as on a cool day, because the temperature required for launch will exceed the maximum sustainable for nylon envelope fabric. Also, in the lower atmosphere, the lift provided by a hot air balloon decreases about 3% for each 1,000 meters (1% per 1,000 ft) of altitude gained. Standard hot air balloons are known as Montgolfier balloons and rely solely on the buoyancy of hot air provided by the burner and contained by the envelope. This style of balloon was developed by the
Alabama Jubilee Hot Air Balloon Classic Alabama Jubilee Hot Air Balloon Classic The Alabama Jubilee Hot-Air Balloon Classic is held annually on Memorial Day weekend in Decatur, Alabama. Each year the Jubilee hosts about 60 local and national hot-air balloons at Point Mallard Park. Public admission is free of charge, and the weekend boasts many fun and exciting activities. Below a partial listing of events that are part of each year's Jubilee: The Alabama Jubilee is unique in that it allows for the crowd of around 50,000 to mingle with pilots and crews, while 7-story tall balloons inflate and float overhead. The Alabama Jubilee Hot-Air Balloon