How do flames burn upward while gravity pulls them down?

Picture differentiates With Gravity and Without Gravity

The air below a candle is relatively cool and dense. The heat of the burning wick expands the surrounding air making it less dense and it rises like a hot-air balloon. As a hot-air balloon rises it is followed up by cooler denser air (like a bubble rising within water). Actually there is a lengthy column of warmer air above the wick and it serves like a chimney drawing up cooler air (draft) which pulls the flame upwards.