🔍 Key Concepts

• Grade A vs other grades of petroleum products under 46 CFR (tank vessel regulations) • The difference between a flammable liquid and a combustible liquid (flash point concept) • Typical examples of jet fuel and lubricating oil in terms of flammability class

💭 Think About

• Think about how petroleum products are classified: is Grade A usually the most hazardous (easiest to ignite) or the least? • Which of the options describes a category based on fire characteristics, and which are just specific products? • How does flash point (the temperature at which a liquid gives off enough vapor to ignite) distinguish flammable from combustible liquids?

✅ Before You Answer

• Verify how Grade A is defined in 46 CFR tank vessel or cargo regulations (look for flash point criteria). • Check whether flammable or combustible refers to liquids with lower flash points (more dangerous) and which one fits Grade A. • Confirm that jet fuel and lubricating oil are examples that usually fall into other grades (not Grade A) based on typical flash points.