PhyIsOhSoHard
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Pathline:
When you can see a particle with your eyes and the trajectory of the particle.
Streakline:
When the particle is "invisible" (such as air) and you have to add paint or dye or something similar in order to see its trajectory.
Timeline:
When a particle has a pathline, except the trajectory of this pathline depends on the time.
Streamline:
Any path that is tangential on the velocity field.
When you can see a particle with your eyes and the trajectory of the particle.
Streakline:
When the particle is "invisible" (such as air) and you have to add paint or dye or something similar in order to see its trajectory.
Timeline:
When a particle has a pathline, except the trajectory of this pathline depends on the time.
Streamline:
Any path that is tangential on the velocity field.