What is the flammable range of propane?

The flammable range of propane is indeed between 2.15% and 9.60% when measured in the air. This range refers to the concentration of propane in air that can ignite and support combustion. It is important for anyone working with propane to understand its flammable range, as this is crucial for safety and risk management when handling or storing the gas.

When the concentration of propane in air falls below 2.15%, there is not enough propane present to support combustion, meaning it is too lean to ignite. Conversely, when the concentration exceeds 9.60%, the mixture is too rich, which also prevents ignition. Proper knowledge of these limits helps prevent accidents and ensures safe operations in environments where propane is used or stored.

The other ranges listed in the incorrect options do not accurately reflect the actual flammable limits for propane, making them unsuitable as the correct answer for this question.