When soup is stirred in a bowl, there is considerable turbulence in the resulting motion (see Video V8.7). From a very simplistic standpoint, this turbulence consists of numerous intertwined swirls, each involving a characteristic diameter and velocity. As time goes by, the smaller swirls (the fine-scale structure) die out relatively quickly, leaving the large swirls that continue for quite some time. Explain why this is to be expected.
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