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流体(英语:Fluid)就是在承受剪應力時將會發生連續變形的物體。气体和液体都是流体。流体沒有一定形狀,几乎可以任意改变形態,或者分裂。
具有黏性的流體在發生變形時將產生阻力,而沒有黏性的流體則不會有任何阻力,度量流體黏性的物理量稱為流體的黏度。沒有黏性的流體又稱為超流體。
而流體的流動形式也有區分。倘流速很慢,流體會分層流動,互不混合,此乃層流。倘流速增加,越來越快,流體開始出波動性擺動,此情況稱之為流体处于過渡区,流型呈现层流或湍流,视情况而定。當流速繼續增加,達到流線不能清楚分辨,會出現很多漩渦,這便是湍流,又稱作亂流、擾流或紊流。
流體大致可分作兩類:
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This article uses material from the Wikipedia article "流体", which is released under the Creative Commons Attribution-Share-Alike License 3.0. There is a list of all authors in Wikipedia
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