🔍 Key Concepts

• Meaning of flash point in relation to temperature and ignition of vapors • How easily a petroleum product forms flammable vapor–air mixtures • Difference between properties like viscosity, pour point, and flammability characteristics

💭 Think About

• Ask yourself: What exactly happens at the flash point — does the liquid change thickness, start to flow, or give off ignitable vapors? • Which choice relates specifically to how readily a fuel can form vapors that can catch fire at a given temperature? • Which options describe physical flow properties of a liquid, and which describe its fire hazard behavior?

✅ Before You Answer

• Be clear that flash point is defined by temperature and ignition of vapors, not by thickness of the liquid. • Mentally separate properties: flow-related (how it pours or how thick it is) vs. fire/ignition-related (how easily it catches fire). • Before picking, verify which option best describes a fuel’s tendency to form flammable vapors as temperature increases.