Path lines are the lines traced by fluid particles to show its movement in the following direction. This trajectory motion of fluid particles can be described using Lagrangian method of fluid flow.
For example, path traced by the smoke particles of cigarette follow path line.
Let us consider the Fig. 4.2 where P1, P2 and P3 are three different fluid particles of fluid flow at time t1 to reach another position at time t2 shows the path lines made by certain particles.
Suppose the fluid flow is steady. In this condition, the path lines will be identical to the stream lines.
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