A pipe has a narrow section where, starting at the left, point 1 is and it then widens out (point 2) and then, maintaining its width, goes down and levels off again to point 3 and widens again to point 4.

If the fluid in the tube is static rank the points based on pressure, from highest to lowest.

1. all points have equal pressure
2. 4 > 3 > 2 > 1
3. 1 = 2 > 3 = 4
4. 4 = 3 > 2 = 1
5. 1 > 2 > 3 > 4
6. None of the above

If the fluid in the tube is flowing from left to right (point 1 to point 4) rank the points based on pressure, from highest to lowest.

1. all points have equal pressure
2. 4 > 3 > 2 > 1
3. 1 = 2 > 3 = 4
4. 4 = 3 > 2 = 1
5. 1 > 2 > 3 > 4
6. None of the above
7. This is ambiguous

If the direction of the fluid flow is reversed, does this change the answer?

1. Yes
2. No