Which of the following has the lowest viscosity (at a given temperature) of all ?
Correct answer: A. Naphtha
- A. Naphtha
- B. Kerosene
- C. Diesel
- D. Lube oil
Explanation
Naphtha is the lightest and least viscous of these petroleum fractions because its molecules are smaller and have lower boiling ranges. Kerosene, diesel, and especially lube oil contain progressively heavier hydrocarbons.
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