What is the maximum percentage for a flammable gas to be ignitable?

The maximum percentage for a flammable gas to be ignitable is 13 percent, which is significant when considering safety and risk management in environments where such gases are present. This threshold indicates the concentration limit of the gas in the air above which it can ignite if an ignition source is introduced.

When the concentration of flammable gas is below this percentage, the mixture may be too lean to sustain a combustion reaction. Thus, understanding this concentration limit is crucial for assessing safety measures in facilities that use or store flammable gases. It helps in establishing proper ventilation, monitoring systems, and emergency response protocols to prevent fire hazards.

In context, other thresholds of 5 percent or 10 percent refer to lower limits or specific conditions that do not capture the full ignitability potential under normal circumstances, while 20 percent is significantly above the ignitable range, indicating an increased risk of combustion.