in a streamlined flow will the fluid molecules collide with each other?????why or why not?????

Hi Anesh Krishna,

Yes the fluid molecules will collide. Else there will be no fluid flow (Newtons Law - any body will remain in rest unless there is an external source that makes the body do otherwise). So a molecule has to get the momentum for the adjacent molecule only.

Regards,

Ashwin (IIT Madras).