As it opens, the pilot uses a propane (a kind of gas) burner to blow hot air into the envelope.The balloon then rises as it is inflated with the hot air until it is upright.

• 当气球充好气后，驾驶员会使用丙烷(气体的一种)燃烧器将热气灌入气囊，当热空气渐渐增加，气球会慢慢的上升，到最后会完全竖立起来。