What is the ideal air and fuel mixture for complete combustion using natural gas?

The ideal air to fuel mixture for complete combustion using natural gas is approximately 1 part fuel to 10 parts air. This ratio ensures that there is enough oxygen available in the air to fully react with the fuel, allowing for the chemical process of combustion to occur efficiently.

In this optimal mixture, the fuel (largely composed of methane in natural gas) reacts with the oxygen in the air to produce carbon dioxide and water, minimizing the production of unburnt hydrocarbons and pollutants such as carbon monoxide. A mixture that is too rich in fuel (more fuel relative to air) can lead to incomplete combustion, resulting in soot and carbon monoxide, while a mixture that has too little fuel will not utilize the available oxygen efficiently, leading to a loss of energy and incomplete combustion as well.

Thus, the option of 1 part fuel to 10 parts air represents the best balance for efficient combustion, making it the correct answer.