🔍 Key Concepts

• Flash point vs. fire point in fuel oils • Relationship between vapor formation and ignition • Why engineers care about “momentary flash” vs. “continuous burning”

💭 Think About

• Ask yourself: does flash point refer to a brief, momentary ignition or to sustained burning? • Which options describe a condition that is enough for safe handling/storage classification, not for actual combustion in a boiler? • Look at the choices that describe normal operating temperatures for burning fuel vs. a safety-related test temperature.

✅ Before You Answer

• Identify which choice talks about momentary ignition versus continuous burning. • Eliminate any options that clearly describe boiler operating conditions or atomization requirements, not a lab safety test. • Make sure the correct definition refers to a test temperature where vapor briefly ignites when exposed to a flame, not where the fuel burns by itself.