充分考虑速度住留时的气体粘度方程

在气体输运过程的初喙理论里，如果采用光滑弹性刚球的分子模型，只要充分考虑到速度住留，就能得到与由气体输运过程的数学理论所得到的几乎完全相同的粘度方程。两者的相对误差仅约为０．２％，由于后者并非严格精的，因此前者必就不如后者精确，并者的推导非常容易，物理图象清晰，形式简单，适于在物理应用中采胜。

The Viscosity Equation of Gas by Taking Persistence of Velocity into Full Consideration

In the elementary theory of gas transport processes, if a molecular model of smooth elastic rigid spheres is adopted, a viscosity equation can be obtained, which is almost the same as that obtained with the mathematical theory of gas transport processes, provided the persistence of velocity is taken into full consideration. The relative error between them is only about 0.2%. As the latter is not strictly accurate, so the former is not less exact than the latter. The former is suitable for physical application because of its very easy deduction, its distinct physical picture and its simple form.