What is the concentration range of natural gas?

The concentration range of natural gas for effective combustion typically lies between 4% to 14% in the air. This range indicates the lower explosive limit (LEL) and the upper explosive limit (UEL) for natural gas, which is primarily composed of methane (CH₄).

At concentrations below 4%, the mixture is too lean to sustain combustion, meaning there isn’t enough fuel for the reaction to occur. Conversely, concentrations above 14% are too rich, leading to a lack of sufficient oxygen, which also prevents combustion. Understanding this concentration range is crucial for safety as it helps to mitigate the risks of explosion or fire hazards in environments where natural gas is used.

Therefore, the correct answer aligns perfectly with the scientifically established thresholds of safe combustion for natural gas.