Gas Fitter Practice Test

What is the ultimate reading of CO2 (carbon dioxide) for natural gas?

1. 9.9%

2. 10.9%

3. 11.9%

4. 13.9%

The correct answer is: 11.9%

The ultimate reading of CO2 for natural gas is typically around 11.9%. This value is significant because it reflects the efficient combustion of natural gas, where complete combustion yields carbon dioxide as a primary byproduct. Understanding this percentage is crucial for assessing the combustion performance and efficiency of gas appliances, as it indicates how well the fuel is being utilized. When natural gas burns completely, the ideal scenario would produce carbon dioxide and water vapor. Variations in the CO2 reading can indicate incomplete combustion, which could lead to various issues, including safety hazards and the generation of other harmful emissions like carbon monoxide. Thus, knowing that 11.9% represents a standard for efficient combustion helps gas fitters ensure that appliances are operating safely and effectively within the acceptable norms for fuel usage. This knowledge is essential not just for compliance with regulations but also for optimizing energy use and minimizing environmental impact.