What is the flammable range of natural gas?

The flammable range of natural gas, which is primarily composed of methane, is indeed between 5% and 15% in air. This range indicates the concentration of natural gas that, when mixed with air, can ignite and support combustion. Below this range, the mixture is too lean to burn, meaning there is not enough gas present to support a flame. Conversely, above this range, the mixture is too rich, leading to insufficient oxygen to sustain combustion. Understanding this range is crucial for safety, as it helps in assessing risks associated with gas leaks and in implementing appropriate safety measures in environments where natural gas is present.