Discussion
Assertion (A): A shock wave may be treated as a discontinuity in any engineering calculation.
Reason (R): Its thickness is of the order of a few molecular mean free paths.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second is the reason for the first. A front well under a micron thick is negligible beside any body dimension, so the jump conditions may be applied across it without resolving its interior. Resolving that interior would in any case require kinetic theory rather than continuum mechanics.
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