Graham's ratio measures which of the following?

Graham's ratio is specifically related to the combustion processes, particularly in the context of gas emissions. It measures the comparative amounts of carbon monoxide produced relative to the oxygen consumed during combustion. This relationship is crucial for understanding the efficiency and environmental impact of combustion reactions, particularly in engines and industrial processes.

By focusing on the carbon monoxide produced as a byproduct of incomplete combustion and the amount of oxygen utilized, Graham's ratio provides insights into the fuel efficiency and potential air pollution implications of the combustion process. Proper analysis of this ratio can help in optimizing combustion systems to reduce harmful emissions and improve overall performance.

The other options do not accurately reflect the concept of Graham's ratio. For instance, measuring the ratio of oxygen produced to carbon monoxide consumed does not align with the definition or applications of this ratio, nor does it pertain to explosibility or general gas emissions in the atmosphere. Each of those aspects addresses different areas of gas analysis unrelated to Graham's specific focus on combustion efficiency and emissions.