Which of the following has the highest viscosity of all (at a given temperature) ?
Correct answer: B. Fuel oil
- A. Naphtha
- B. Fuel oil
- C. Light diesel oil
- D. Petrol
Explanation
Fuel oil contains heavier, higher-molecular-weight hydrocarbons than naphtha, petrol or light diesel oil, so its resistance to flow is greatest at the same temperature. Viscosity generally increases with boiling range and molecular size.
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