Flammable gas is ignitable in a mixture of what percentage or less?

The question pertains to the flammability limits of gases, which define the concentration range of a gas in air that can ignite. For many common flammable gases, the lower flammable limit (LFL) is often around 10-15 percent in air. Specifically, a mixture of flammable gas can ignite at concentrations of about 13 percent or less, making it a significant threshold.

In this context, the selection of 13 percent reflects a standard understanding of flammable range definitions, as this is the point at which a gas would typically become hazardous and possibly ignite under the right conditions. Understanding these limits is crucial for ensuring safety when handling compressed gases in various environments. Therefore, recognizing the significance of the 13 percent mark helps retain compliance with safety protocols regarding flammable materials.