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所有的液体、气体都具备其固有的粘度。通常只要给液体或气体一定的磨擦应力作用,就会产生一定的磨擦速度。例如,在液体中有二个相互平行的A面与B面,若将外力沿着与B面相平行的方向作用于A面,则与A面相连接的液体因运动而产生速度。假如与B面相连接的液体此时并没有产生速度,那么,在A面与B面之间就会出现层流。再例如,在累起来的朴克牌最上面,用手轻轻下压同时向前推移也会产生同样的效果。假如A面与B面之间的距离是2cm,与A面相连接的液体产生的速度
All liquids, gases have their inherent viscosity. Usually as long as the liquid or gas friction to a certain extent, it will have a certain friction speed. For example, there are two parallel sides A and B in the liquid. If an external force is applied to side A in a direction parallel to side B, the liquid connected to side A produces velocity due to the movement. If the liquid connected to surface B does not produce velocity at this time, laminar flow will occur between surface A and surface B. For another example, at the top of a puffed up hand, the same effect can be achieved by gently pressing down while pushing forward. If the distance between the A surface and the B surface is 2 cm, the velocity of the liquid connected to the A surface