True vapour pressure of a petroleum fraction ________________ Reid vapour pressure?
Correct answer: D. May be either more or less than
- A. Is less than
- B. Is more than
- C. Is same as
- D. May be either more or less than
Explanation
Reid vapour pressure is measured under a fixed condition at 37.8°C, whereas true vapour pressure refers to equilibrium at the specified temperature and composition. Because the temperatures and test conditions may differ, true vapour pressure may be either higher or lower than RVP.
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