🔍 Key Concepts

• Grade A flammable liquid definition in 46 CFR (look at how grades A, B, C are distinguished) • Reid vapor pressure (RVP) – what it measures and typical pressure ranges • How vapor pressure relates to volatility and flash point for cargo grades

💭 Think About

• First recall: among Grades A, B, and C, which grade is the most volatile / highest vapor pressure? • Think about whether Grade A cargoes are expected to have relatively low, medium, or very high vapor pressure at normal temperatures. • Compare each answer choice to what you’d expect for a very volatile cargo’s vapor pressure range.

✅ Before You Answer

• Check the regulatory definition of Grade A flammable liquids in 46 CFR Part 30–35 (cargo regulations). • Confirm which numerical vapor pressure range is associated with Grade A in that definition. • Verify that the units are psia at a specified temperature (usually 100°F) so you’re matching like‑for‑like.