This paper challenges the idea that vapor pressure alone determines how easily flammable liquids catch fire. The researchers studied how flammable liquid properties like the ability to ignite and burn affect their dangers instead of just looking at vapor pressure. They created a Flammability Index to measure this risk. Surprisingly, ethanol, despite having lower vapor pressure than crude oil, was found to be a higher fire risk due to its flammability properties. This means that solely relying on vapor pressure to assess the risk of flammable liquids might not give the full picture.