How does convection in a hot air balloon rise?

In a hot air balloon, convection occurs when the air inside the balloon is heated by a burner, causing it to become less dense than the cooler air outside. As the warm air rises, it creates an upward buoyant force that lifts the balloon. This process continues as long as the air inside the balloon remains warmer than the surrounding air, allowing the balloon to ascend. When the burner is turned off, the air cools, and the balloon gradually descends.