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The flash point of an oil is the lowest temperature at which its vapour

  • A.decomposes into lighter fractions
  • B.ignites momentarily on application of a flame
  • C.burns continuously for at least five seconds
  • D.begins to evaporate from the surface

Answer: B

Correct answer: ignites momentarily on application of a flame

The flash point is the temperature at which enough vapour has accumulated to flash on the application of a flame, and it flashes rather than continues to burn. It is a safety and volatility measure rather than a lubrication property, and it must comfortably exceed the working temperature.

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