Correct Answer : Option (A) : Knudsen number
Explanation : Ratio of mean free path to characteristic length is called Knudsen number. Nusselt number is used in heat transfer.
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.