Hot air balloon being inflated
Media playback is unsupported on your device

How do you make a hot air balloon fly?

Events are under way at the 32nd Bristol International Balloon Fiesta, but how is it that the hot air balloons take to the skies?

The BBC's John Maguire has been speaking to those in the know to find out more.

  • 13 Aug 2010
Go to next video: Mass ascent at Bristol Balloon Fiesta