What is the flammability range of the substance in air?

The flammability range of a substance in air refers to the concentration range in which the substance can ignite and sustain combustion when mixed with air. This range is typically expressed as a percentage of the substance in a mixture with air, indicating the lower and upper limits at which the mixture can be ignited by a sufficient energy source.

Choosing the answer that indicates a flammability range of 16 - 25% signifies that within this specific concentration, the substance is most likely to ignite if exposed to an adequate ignition source. This range is commonly used in safety data sheets and is critical for assessing hazards in industrial settings. Understanding this range is vital for safety protocols, as it informs operators of the concentrations that can lead to a fire or explosion hazard.

In industrial refrigeration and other industries utilizing combustible substances, being knowledgeable about their flammability range helps ensure proper handling, storage, and ventilation to mitigate risks.