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5 THE COMPOSITION OF THE EARTH AND ITS ATMOSPHERE AND THE PROCESSES OCCURRING WITHIN THEM SHAPE THE EARTH’S SURFACE AND ITS CLIMATE
- Theory
- TASKS
- WORKSHEETS FOR PUPILS
Task 10
Materials and tools for a working group:
glass, water, ice, dishcloth
In this task, pupils investigate the formation of water vapor. They will find out how and under what conditions water vapor condenses from gas to liquid and how the temperature affects this change. At the same time, they may notice that temperature is not the only factor affecting the rate of evaporation of water. Another important factor is the amount of water vapor found in the air. Even at higher temperatures, the evaporation rate does not necessarily increase if there is already a high concentration of water vapor in the air.
Pic 60: Condenstion process
The teacher can start the activity by showing the pupils a concept cartoons© image in which four people think why an ice cup is wet from the outside. The task of the pupils will be to think about which statement and choose one they agree with and further justify the choice. If they disagree with the statement of any character, they can create their own.
The teacher discusses with the pupils to find out their ideas about condensation. After making the predictions (marking the person they agree with), the teacher asks the pupils to think about how they could verify their statements.
They can e.g. realize the situation in the picture, changing the jar (to see if the water leaks) and the water temperature, or its amount. Pupils do not have to explain exactly what is happening during condensation – it will be enough to investigate when “drops” on the glass occur and when not.