Jisho

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Noun
1. flow line; streamline; lines representing the flow of a fluid
Wikipedia definition
2. Streamlines, streaklines, and pathlinesFluid flow is characterized by a velocity vector field in three-dimensional space, within the framework of continuum mechanics. Streamlines, streaklines and pathlines are field lines resulting from this vector field description of the flow. They differ only when the flow changes with time: that is, when the flow is not steady. Streamlines are a family of curves that are instantaneously tangent to the velocity vector of the flow.
Read “Streamlines, streaklines, and pathlines” on English Wikipedia
Read “流線” on Japanese Wikipedia
Read “Streamlines, streaklines, and pathlines” on DBpedia

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