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nature : Newton by the internal friction of the fluid phenomenon of the law. Suppose two adjacent parallel with fluid flow, when its flow rate is not equal, the two of them will have fluid friction within. Newton's law of friction is : inside a two-layer fluid friction values, and two relative movement between the two tiers of access speed and the size is proportional, that is perpendicular to the flow direction is proportional to the velocity gradient. This ratio constant (with the fluid nature of the different), said the viscosity or viscosity.
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