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凡是可以流动的气体和液体统称流体。流体都有粘性,例如胶水,由于它有粘性,所以能粘东西。然而最常见的流体空气和水,虽然也有粘性,但其粘力相对于压力和重力来说,往往很小很小,所以在研究流体流动现象时常被忽略。19世纪末所建立的理论流
Any fluid and gas that can flow are referred to as fluids. The fluid is sticky, such as glue, which can stick because of its tackiness. However, the most common fluid, air and water, although also viscous, have viscous vis-a-vis pressures and gravities that are often small and small and are often overlooked in the study of fluid flow phenomena. The theoretical flow established at the end of the 19th century