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Correct Answer : Option (B) : dimension
Explanation : Knudsen number does not have any dimension and units.
Correct Answer : All of the above
Correct Answer : transient region
Explanation : Knudsen number ranges in between 0.3 and 1 in transient region.
Correct Answer : 1
Explanation : When altitude of earth is in between 90 km and 150 km Knudsen number can be in between 0.3 and 1.
