Master NGA 85: Ace the 2026 AOCs and Meter Assembly Challenge!

The concept being tested is identifying the exact labeled property for a given substance in Definition 4.5. The ignition temperature term for propane is the explicit label that names propane’s autoignition temperature—the temperature at which propane will ignite in air without an external flame. This is a distinct entry from other properties like how dense propane is relative to air (specific gravity) or from ignition temperatures of other fuels. Since the question asks for propane’s ignition temperature, the entry that states “Ignition temperature of Propane” directly matches that property, making it the correct choice.