Do I understand streamline, streakline and pathlines correctly?

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SUMMARY

This discussion clarifies the definitions and distinctions between pathlines, streaklines, streamlines, and timelines in fluid dynamics. A pathline represents the trajectory of a visible particle, while a streakline is the trajectory of an invisible particle made visible through dye. A timeline is similar to a pathline but emphasizes the temporal aspect of the particle's trajectory. Streamlines are defined as paths that are tangential to the velocity field at any given point.

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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.
 
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