Circulation — Science definition
A connected pattern of fluid movement with exchange and return pathways.
Where it is taught
- Air, Pressure & Uneven Heating — Water, Air, Weather & Climate, Science 6: Matter, Energy & Earth Systems, Grade 6
Questions using circulation
Problem 1
Which statement correctly uses circulation in Air, Pressure & Uneven Heating?
- circulation: A connected pattern of fluid movement with exchange and return pathways.
- Air has no mass because it is invisible.
- Uneven heating determines every wind direction without other influences.
- One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation
circulation: A connected pattern of fluid movement with exchange and return pathways.
A connected pattern of fluid movement with exchange and return pathways. The difference is 12 hPa. The simplified model predicts air responding from A toward lower-pressure B. This is not an exact real-wind forecast, because the actual path also depends on rotation, friction, terrain, and surrounding pressure patterns. Pressure is a comparison, not a cause inferred from one unlabeled arrow.