🔍 Key Concepts

• Flash point definition: the lowest temperature at which a liquid gives off enough vapor to ignite momentarily when given an ignition source. • The difference between flammable and combustible liquids in U.S. maritime regulations (flammable = lower flash point, combustible = higher flash point). • How grades of flammable/combustible liquids (A–E) are arranged from most hazardous (lowest flash point) to least hazardous (highest flash point).

💭 Think About

• Think about whether Grade E is more or less hazardous than Grades A, B, and C. Should its flash point be higher or lower than the others? • Among the answer choices, which range clearly represents the highest flash point values overall? • Does a combustible liquid with a high flash point ignite more easily or less easily than one with a low flash point—and which range fits that idea?

✅ Before You Answer

• Confirm that combustible liquids have higher flash points than flammable liquids under U.S. regulations. • Check which option has the highest minimum temperature listed—that’s key for the least hazardous grade. • Eliminate any ranges that overlap more with typical flammable liquid temperatures (i.e., lower flash points).