What are the flammable limits of natural gas in air?

Natural gas has flammable limits in air that range from 4% to 15% by volume. This means that for combustion to occur, the concentration of natural gas in the air must be within this specific range. Below 4%, the mixture is too lean to ignite, and above 15%, it becomes too rich for combustion to take place. Understanding these limits is crucial for safety protocols, as they help in determining when a potentially hazardous atmosphere may exist. This knowledge is vital for effective risk management and ensuring proper safety measures are in place in environments where natural gas is present.