What is the percentage of methane in clean natural gas?

Clean natural gas primarily consists of methane, typically constituting the majority of its composition. The correct choice reflects that methane usually comprises approximately 85% to 95% of the total volume of natural gas. This high percentage is due to the fact that natural gas is primarily extracted from sources that are rich in methane, making it an efficient and clean-burning fuel.

Other hydrocarbons, such as ethane, propane, and butane, are also present but in significantly smaller proportions compared to methane. This is why the range you selected is accurate; methane's predominance allows it to be classified as the main component of natural gas, making it essential for its usage in energy production and heating applications. Understanding this percentage is crucial for engineers and technicians in the field, as it informs combustion efficiency, safety calculations, and energy content estimations of natural gas systems.

The other options suggest percentages that either underestimate or overestimate methane's contribution to natural gas. The range of 75-85% is lower than typical values, while 80-90% might still be an acceptable range but does not encompass the dominant presence of methane adequately. The option indicating 90-100% could imply an unrealistic purity level rarely found in natural gas, as it