The porcupine is very different from other rodents in North America because it is so large, has a big head and, of course, because of its long quills. Porcupines have around 30,000 quills, mostly on their backs and rumps. The longest quills are near the tail and the shortest are on their cheeks.
The divergence of a vector field simply measures how much the flow is expanding at a given point. It does not indicate in which direction the expansion is occuring. Hence (in contrast to the curl of a vector field), the divergence is a scalar.he fact that fluid is flowing out of the sphere is a sign of the positive divergence of the vector field. Rotate with mouse to change perspective. You can move the sphere by dragging it with the mouse.
The point where two things split off from each other is called a divergence. When you're walking in the woods and face a divergence in the path, you have to make a choice about which way to go. A divergence doesn't have to be a physical split â it can also be a philosophical division. The divergence of opinion between a school board and a group of parents might cause such a heated argument that the students at the meeting are obviously better behaved than the adults.