Question

संयुक्त राष्ट्र संघ सफलता के 66 संयुक्त राष्ट्र का मुख्य उद्देश्य विश्व में युद्ध रोकना मानव अधिकारों की रक्षा करना अंतरराष्ट्रीय कानून को निभाने की प्रक्रिया जुटाना सामाजिक और आर्थिक विकास और धारणा जीवन स्तर सुधारना और बीमारियों से लड़ना है इससे संगठन ने दुनिया भर में कई अहम मौकों पर मानव जीवन की सेवा कर रुक आदर्श प्रस्तुत किया है ​

Answer 1

Explanation:

Streamlines are a family of curves that are instantaneously tangent to the velocity vector of the flow. These show the direction in which a massless fluid element will travel at any point in time.[3]

Streaklines are the loci of points of all the fluid particles that have passed continuously through a particular spatial point in the past. Dye steadily injected into the fluid at a fixed point extends along a streakline.

Pathlines are the trajectories that individual fluid particles follow. These can be thought of as "recording" the path of a fluid element in the flow over a certain period. The direction the path takes will be determined by the streamlines of the fluid at each moment in time.

Timelines are the lines formed by a set of fluid particles that were marked at a previous instant in time, creating a line or a curve that is displaced in time as the particles move.