How hot air balloons use convectional currents?

Hot air balloons operate on the principle of convection currents by heating the air inside the balloon with a burner. As the air inside the balloon warms up, it becomes less dense than the cooler air outside, causing the balloon to rise. This difference in density creates an upward buoyant force, allowing the balloon to ascend. When the air inside cools, it becomes denser, and the balloon descends as the heated air rises and cools down, creating a continuous cycle of convection.