What does the term "range of flammability" refer to?

The term "range of flammability" specifically refers to the concentration range of a gas in air that will support combustion. When the mixture of LP gas and air falls within this defined range, the mixture can ignite and sustain a fire. This concept is critical in safety considerations when handling and utilizing gases, as it identifies the conditions under which a gas is most likely to pose a fire hazard.

The correct answer highlights that both too little or too much gas in the air will lead to an inability to ignite, indicating that there is a specific balance required for combustion. Understanding this range is essential for anyone working with LP gas to mitigate risks effectively.

Other options detail different aspects related to gases but do not accurately describe the range of flammability. For instance, ignition temperature and pressure specifics relate to different safety parameters concerning combustion and behavior but do not encompass the broader concept of ideal air-gas mixtures for ignition.