Q.

Which among the following is the formula for Knudsen number?

A. λ⁄l
B. λ⁄2l
C. λ⁄3l
D. λ⁄4l
Answer» A. λ⁄l
Explanation: the formula for knudsen number is λ⁄l. knudsen number in fluid mechanics deals with gas dynamics. it is defined as the ratio of the molecular mean free path length to the representative scale length.
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