题目内容
A turbine is a rotary engine which is driven by a stream of fluid (liquid or gas) directed on to the blades of the stator (定子).
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Molecular activity gives the rise to an apparent shear stress in gases which is more important than the cohesive forces and since molecular activity increases with temperature，the viscosity of a gas also increases with temperature.
The viscosity of a gas decreases with temperature，but the viscosity of a liquid increases with temperature.
Newton's law of viscosity states that for a given rate of angular deformation of fluid the shear stress is directly proportional to the viscosity.
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