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Mr. Dubey • 52.30K Points
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Q. Which among the following is the formula for Knudsen number?

(A) λ⁄l
(B) λ⁄2l
(C) λ⁄3l
(D) λ⁄4l
Correct : Option (A)

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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