Prandtl number for water at 20°C is about ________________?
Correct answer: A. 7
- A. 7
- B. 70
- C. 0.7
- D. 150
Explanation
For water near 20°C, the Prandtl number is approximately 7. It is much greater than unity because momentum diffusivity is about seven times thermal diffusivity in water.
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