What happens to buoyancy as the temperature of combustion gases increases?

As the temperature of combustion gases increases, buoyancy increases. This is because buoyancy is directly related to the density of the gases in relation to the surrounding air. When combustion gases are heated, they expand and become less dense than the cooler air around them.

In a typical scenario, warmer air or gas is lighter, leading to a greater upward force acting on it due to buoyancy. This is the principle behind how hot air balloons rise; the heated air inside the balloon is less dense compared to the cooler air outside, causing it to ascend.

When applied in the context of combustion gases, as their temperature rises, the decrease in density results in increased buoyancy, allowing the gases to rise more easily. Thus, when you encounter a situation where combustion gases are involved, an increase in temperature directly correlates with an increase in buoyancy.