This topic is about streamlines, pathlines and streaklines. Please could you see if you could help me out, only if you answer one of the questions would be a great help. Thanks alot 1) When are these line identical?? 2) Is the visualied line a streamline, pathline or a streakline in the following cases. a) The stream plume released from a vent pipe at a power plant. b) The vapour trail of a jet airplane. c) The smoke released from a source upstrean of a model in a wind tunnel experiment. The wind tunnel flow is steady. d) A nuetrally bupyant helium ballon carried in the wind.