What is the explosive range of natural gas in the air?

The explosive range of natural gas in the air is indeed 5% to 15%. This range is critical for understanding the potential hazards when dealing with natural gas, as it indicates the concentration levels at which natural gas can ignite when mixed with air. Below 5%, the mixture is too lean to ignite, meaning there is not enough gas in the air. Conversely, above 15%, the mixture is too rich for combustion, and while it can still be dangerous due to the presence of natural gas, it will not ignite under standard atmospheric conditions. Knowing this range is vital for firefighters and first responders, as it helps them assess risks, implement safety measures, and take appropriate actions when responding to incidents involving natural gas, thus ensuring both their safety and that of the public.