At what temperature do most flammable liquids ignite?

Flammable liquids typically ignite at temperatures below 100°F due to their lower flash points. The flash point is the temperature at which a liquid's vapors can ignite when exposed to an open flame or spark. Most flammable liquids have flash points well below this threshold, making them particularly hazardous.

For instance, common flammable liquids like gasoline have flash points around -40°F, while others like ethanol have flash points around 55°F. This means that these substances can easily produce ignitable vapors at ambient temperatures well below 100°F, leading to a higher risk of fire.

In contrast, options indicating ignition temperatures of 200°F and above are generally referring to combustible liquids, which require higher temperatures to ignite. These higher temperature ranges are less relevant for most common flammable liquids, emphasizing the importance of recognizing the dangers associated with lower temperature thresholds for ignitability.