What happens to flames when gas pressures are unsteady?

When gas pressures are unsteady, the flames fluctuate primarily due to the variations in the fuel-to-air mixture that reaches the burner. Fluctuating gas pressure can lead to an inconsistent flow rate of gas, causing the flame height and stability to change. As the gas pressure increases or decreases, the amount of gas being supplied to the burner fluctuates, which directly impacts the size and intensity of the flame.

This fluctuation can manifest as the flame rising or falling, flickering, or dancing, depending on the stability of the pressure supply. Understanding this behavior is crucial for maintaining proper combustion and ensuring safety when working with gas appliances. The stability and uniformity of the flame are essential for efficient energy use and for preventing dangerous situations such as incomplete combustion, which could lead to the production of harmful gases like carbon monoxide.