Science · Year 5

Active learning ideas

Changes of State: Evaporation and Condensation

Active learning works well for this topic because evaporation and condensation happen all around us, but students often miss the science behind everyday events. By measuring, observing, and designing, students connect particle behavior to real phenomena they see in their lives.

• ACARA Content Descriptions
• AC9S5U04

• 25–50 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Inquiry Circle
• 45 min · Small Groups

Investigation Stations: Evaporation Factors

Prepare stations for temperature (hot vs room temp water), surface area (wide vs narrow dishes), airflow (with fan vs still air), and humidity (covered vs open). Students predict outcomes, measure mass loss every 5 minutes for 20 minutes, record data, then rotate. Conclude with class graph discussion.

Analyze the factors that increase the rate of evaporation.

Facilitation Tip

During Investigation Stations: Evaporation Factors, place the containers in different locations at the same time to minimize variables like air movement or sunlight changes.

What to look for

Present students with three identical containers of water. Instruct them to place one in a sunny spot, one in a breezy area, and one in a cool, shaded spot. Ask them to predict which will evaporate fastest and explain why, using the terms evaporation and kinetic energy.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 02

• Inquiry Circle
• 25 min · Pairs

Cloud in a Jar: Condensation Demo

Half-fill clear jars with hot water, seal with plastic wrap, and place ice cubes on top. Students observe water droplets forming on the plastic underside and sketch changes. Guide discussion on cooling vapor and cloud formation parallels. Pairs then try variations like adding smoke for visible particles.

Explain how condensation leads to cloud formation.

Facilitation Tip

When running Cloud in a Jar: Condensation Demo, use warm water and ice to create a clear temperature gradient, making the condensation layer visible.

What to look for

Pose the question: 'Imagine you are a scientist studying clouds. What experiment could you design to show how condensation forms clouds?' Guide students to discuss variables like cooling and water vapor.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 03

• Inquiry Circle
• 50 min · Pairs

Design Challenge: Evaporation Experiment

Pairs brainstorm a fair test for one evaporation factor, write hypotheses and procedures, gain approval, then conduct trials measuring drying time or mass change. They present results with graphs to the class. Emphasize safety and variables control.

Design an experiment to demonstrate the process of evaporation.

Facilitation Tip

In Design Challenge: Evaporation Experiment, require students to measure mass changes over time using the same balance for all containers to ensure reliable data.

What to look for

On an index card, ask students to draw a simple diagram illustrating evaporation and condensation. They should label the processes and write one sentence explaining the difference between them.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 04

• Inquiry Circle
• 30 min · Small Groups

Classroom Hunt: Real-Life Examples

Provide checklists of evaporation and condensation signs around school (wet clothesline, cold drink condensation). Students in small groups photograph or sketch examples, explain processes using particle ideas, and share in a gallery walk.

Analyze the factors that increase the rate of evaporation.

Facilitation Tip

During Classroom Hunt: Real-Life Examples, have students take photos of their examples and explain the process in writing to reinforce observation and reasoning.

What to look for

Present students with three identical containers of water. Instruct them to place one in a sunny spot, one in a breezy area, and one in a cool, shaded spot. Ask them to predict which will evaporate fastest and explain why, using the terms evaporation and kinetic energy.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

A few notes on teaching this unit

Teach this topic with a mix of hands-on experiments and guided questioning. Start with observations to build curiosity, then move to structured investigations to test variables. Avoid explaining particle theory too early; let evidence guide their understanding first. Research shows students grasp changes of state better when they connect particle behavior to measurable outcomes, so emphasize data collection and graphing throughout.

Students will accurately explain how temperature, surface area, and airflow affect evaporation, and how cooling leads to condensation. They will use evidence from experiments to revise misconceptions and apply their understanding to new situations.

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Watch Out for These Misconceptions

• During Investigation Stations: Evaporation Factors, watch for students who assume evaporation only happens at high temperatures because they see boiling in daily life.

  During Investigation Stations: Evaporation Factors, have students graph the mass loss over time for each container. Ask them to connect the gradual decrease in mass (without bubbles) to the idea that evaporation occurs at all temperatures, even when no boiling is visible.

• During Cloud in a Jar: Condensation Demo, watch for students who think condensation only forms on solid surfaces like glass or mirrors.

  During Cloud in a Jar: Condensation Demo, ask students to observe the cloud forming in the air inside the jar. Then, have them draw the particle movement from warm vapor cooling to liquid droplets, emphasizing that surfaces just make condensation visible.

• During Design Challenge: Evaporation Experiment, watch for students who claim the water has disappeared entirely after evaporation.

  During Design Challenge: Evaporation Experiment, have students weigh the containers before and after evaporation. Then, during the condensation activity, ask them to predict where the “missing” water went, using their data to reinforce the idea of conservation of mass.

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Methods used in this brief

• Inquiry Circle