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<p><a href="page.php?w=rarefaction">rarefaction</a> when travelling through a medium, and <b>pressure waves</b>, because they produce increases and decreases in <a href="page.php?w=pressure">pressure</a>. A wave along the length of a stretched <a href="page.php?w=Slinky">Slinky</a> toy, where the distance between coils increases and decreases, is a good visualization. Real-world examples include <a href="page.php?w=sound_wave">sound wave</a>s (vibrations in pressure, a particle of displacement, and particle velocity propagated in an <a href="page.php?w=elasticity_%28physics%29">elastic</a></p><p>
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