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
2012 Ljubljana Marshes hot air balloon crash 2012 Ljubljana Marshes hot air balloon crash The 2012 Ljubljana hot air balloon crash occurred on the Ljubljana Marshes in central Slovenia on 23 August 2012, killing six people while 26 others survived. A hot air balloon carrying 32 passengers, mostly tourists, crashed and caught fire during a thunderstorm on the Ljubljana Marshes, in the Municipality of Ig, between Lavrica, Črna Vas and Ig, next to Ig Street (), two hundred meters from the turn for Matena, seven kilometres south of Ljubljana. A sudden weather change caused the pilot to try to land immediately. However, the emergency landing was thwarted