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<p>is preserved but <a href="page.php?w=entropy">entropy</a> increases. This change in the matter's properties manifests itself as a decrease in the energy which can be extracted as work, and as a <a href="page.php?w=wave_drag">drag force on supersonic objects</a>; shock waves are strongly <a href="page.php?w=irreversible_process">irreversible process</a>es.</p>

<p><big> Terminology </big></p>
<p>Shock waves can be:; Normal: At 90° (perpendicular) to the shock medium's flow direction.; <a href="page.php?w=Oblique_shock">Oblique</a>: At an angle to the</p><p>
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