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<p>(the resistance of an elastic body to deformation by an applied force) of the material, and decreases with the density.For general equations of state, if classical mechanics is used, the acoustic velocity  is given by</p>

<p>with  as the pressure and  the density, where differentiation is taken with respect to adiabatic change.</p>

<p><big> Phenomena </big></p>
<p>Acoustic waves are elastic waves that exhibit phenomena like <a href="page.php?w=diffraction">diffraction</a>, <a href="page.php?w=Reflection_%28physics%29">reflection</a> and <a href="page.php?w=Interference_%28wave_propagation%29">interference</a>.</p><p>
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