I'm currently working on a project about wind speeds, and have come across a roadblock due to my limited knowledge... So I really hope you guys can help me out. When you light a campfire or candle, the heat from the flames cause the air around it to rise, which leaves a "vacuum" for colder surrounding air to rush in towards the flame, causing convection currents. I only know that the wind speed rising from the flame increases with the temperature of the fire. So here's the question, is there a known constant for this proportional relationship? Or is there an overall fluid dynamics formula for this question?