Air, Pressure & Uneven Heating — Practice · Grade 6 Science
Chapter: Water, Air, Weather & ClimateWhat this practice covers
By the end of Air, Pressure & Uneven Heating you should be able to:
- I can explain what causes atmospheric pressure and why it falls with height.
- I can explain how uneven heating produces a pressure difference and therefore wind.
- I can describe how a sea breeze forms and why it reverses at night.
8 questions, written answer and multiple choice, each with a worked explanation.
Vocabulary used: air pressure, circulation, evidence, system boundary, uncertainty.
Problem 1
Answer and explanation
Yes. Moving particles interact with surfaces in different orientations; pressure is not only a downward push.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 2
Answer and explanation
The amount of gas, whether volume can change, and how the sample interacts with surroundings.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 3
Answer and explanation
It helps account for moving air and makes the circulation model coherent instead of showing air accumulating indefinitely.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 4
Answer and explanation
No. Rotation, friction, terrain, and the larger pressure pattern can alter the actual flow.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 5
Answer and explanation
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.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 6
Answer and explanation
No. The same amount can occupy a larger volume in a flexible boundary. State the container conditions before inferring an amount change.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 7
- One illustrative result establishes every real condition and needs no further evidence.
- Air has no mass because it is invisible.
- Uneven heating determines every wind direction without other influences.
- air pressure: Force per area associated with air’s interactions and atmospheric conditions.
Answer and explanation
air pressure: Force per area associated with air’s interactions and atmospheric conditions.
Force per area associated with air’s interactions and atmospheric conditions. 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.
Problem 8
- 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.