Read water phase changes in weather

Supplied materials

• All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
• Paper or a browser document for a labeled drawing, table or explanation.
• Worked problem inputs: A record describes invisible vapor becoming cloud droplets as moist air cools. Explain the state change.
• Assessment case 1: Water evaporates from a surface and later condenses in a cloud model. What remains conserved? Which inference or prediction is best supported?
• Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Cloud droplets form from vapor.
• Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Liquid droplets become ice.
• Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Snow becomes liquid water.
• Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: Puddle water changes into vapor.
• Assessment case 6: A supplied ice sample melts into liquid with the same water identity. What follows? Which inference or prediction is best supported?

Learn the idea

Evaporation adds water vapor; condensation forms droplets when conditions allow. Clouds are droplets or ice. Cooling moist air can lead to condensation, but not every cloud produces precipitation.

Evaporation means liquid enters gas phase. Condensation means vapor forms liquid droplets. Freezing means liquid becomes solid. Melting means solid becomes liquid.

For the supplied mechanism problem, A record describes invisible vapor becoming cloud droplets as moist air cools. Explain the state change. Condensation changes water from gas to liquid droplets. A visible cloud is not just invisible vapor. Cooling can allow condensation under suitable moisture conditions, but rain is not guaranteed.

1. Read the supplied problem and mark the structures, processes or quantities named: A record describes invisible vapor becoming cloud droplets as moist air cools. Explain the state change.
2. Draw the relevant boundary, pathway or comparison and label it using the scientific ideas above.
3. Write a causal explanation or calculation, showing how each observation supports the result.
4. Compare your reasoning with the worked solution; name a condition that would change or limit the inference.

Check your reasoning

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Take it further

New case: droplets appear after moist air cools, but none fall from the cloud. Expected: condensation has occurred; precipitation has not been demonstrated. Visible droplets are not merely invisible vapor.

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