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The combustion of fuel oil is a chemical process in which carbon in the fuel unites with oxygen to produce carbon dioxide and energy. Understanding the percentage of carbon that combusts is crucial for efficiency and environmental considerations.

When we look at the combustion process, it's established that, typically, a large portion of the carbon content in fuel oil effectively reacts with oxygen. Research indicates that approximately 85% of the carbon in fuel oil will unite with oxygen during combustion. This figure allows us to assess the expected efficiency of the fuel and the amount of emissions produced.

The remaining carbon may not fully combust due to factors like incomplete combustion, which could arise from insufficient oxygen, poor mixing, or low combustion temperatures. Thus, recognizing that around 85% of the carbon content undergoes combustion offers a realistic understanding of fuel oil performance in practical applications and aligns with standard combustion efficiency metrics.