Explain the term 'laminar flow'. Is the velocity of molecules same in all the layers in laminar flow? Explain your answer.

(N/A) When a liquid flows over a fixed surface,the layer of molecules in contact with the surface is stationary.
As the distance of the layers from the fixed surface increases,the velocity of the upper layers increases.
This type of flow,in which there is a regular gradation of velocity when passing from one layer to the next,is called laminar flow.
In laminar flow,the velocity of molecules is not the same in all the layers because every layer offers some resistance or friction to the layer immediately below it,resulting in a velocity gradient.