What are the explosion limits for Natural Gas?

Natural gas has specific explosion limits, commonly known as the lower explosive limit (LEL) and upper explosive limit (UEL). For natural gas, the lower explosive limit is approximately 4% by volume in air, and the upper explosive limit is around 15% by volume. This range means that if the concentration of natural gas in the air is below 4%, it is too lean to ignite, while concentrations above 15% are too rich to sustain combustion. Therefore, the correct range of explosion limits for natural gas is indeed 4 to 15%, making this answer accurate and based on foundational knowledge of gas safety. Understanding these limits is crucial for safe handling and management of natural gas in various environments.