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. Nique-d-'un and . Milieu, P la pression, u la vitesse, ? la masse volumique et c la célérité du choc) Pour obtenir une onde de choc, il est nécessaire que le temps d'application du choc soit très court (<µs)

. On-note, P 1 , ? 1 , u 1 l'état du fluide après le passage de l'onde à la célérité c. La conservation de la masse du fluide au temps t nous donne : ? 0

. En-Écrivant-le-principe-fondamental-de-la-dynamique, la quantité de mouvement du fluide sous choc ? 0 .S.(c?U 0 ).t.(u 1 ?u 0 ) est égale à l'impulsion des forces de pression s'exerçant sur cette tranche, (P 1 ?P 0 ).S.t. On obtient la relation suivante