Evaporation and Condensation: Water's Ascent

Active experiments let students feel water’s invisible changes in real time. Hands-on trials with dishes, jars, and plants replace abstract talk with measurable shifts in time, mass, and visibility, making science concrete for young learners.

• 5th Year
• Exploring Our World: Global Connections and Local Landscapes
• 4 activities
• 20 min–50 min

Learning Objectives

1. Explain how solar energy causes water to change from liquid to gas, increasing its presence in the atmosphere.
2. Compare and contrast the processes of evaporation and transpiration, identifying the primary sources of water vapor release.
3. Analyze the atmospheric conditions, such as temperature and air movement, that are necessary for water vapor to condense into visible clouds.
4. Calculate the rate of evaporation from a controlled water sample under varying temperature and wind conditions.

Experiential Learning

⏱ 45 min·Pairs

Pairs Experiment: Evaporation Rates

Pairs set up four shallow dishes with equal water volumes: one in sun, one shaded, one with wind from a fan, one still. They measure water levels daily for three days and graph changes. Discuss which factor sped evaporation most.

Prepare & details

Explain how solar energy drives the process of evaporation from various water bodies.

Facilitation Tip: When students do the Dew Point Hunt, provide clipboards with simple tables for noting surface temperatures and dew amounts to turn casual noticing into measurable data.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Experiential Learning

⏱ 30 min·Small Groups

Small Groups Demo: Cloud in a Jar

Groups place hot water in a jar, add aerosol spray for nuclei, then seal with ice on top. They observe vapor rise, cool, and form cloud-like droplets. Record temperature changes and draw before-after sketches.

Prepare & details

Differentiate between evaporation and transpiration in the context of the water cycle.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Experiential Learning

⏱ 50 min·Whole Class

Whole Class Track: Classroom Transpiration

Class plants equal pots of soil with seedlings. Half get plastic bags over leaves to trap transpired vapor; observe condensation inside. Compare daily mass changes to bare soil pots and chart results.

Prepare & details

Analyze the conditions necessary for water vapor to condense and form clouds.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Experiential Learning

⏱ 20 min·Individual

Individual Log: Dew Point Hunt

Students predict and test dew on grass, car windows, or mirrors each morning. Log temperature, humidity from a school meter, and note when condensation appears. Share findings in a class timeline.

Prepare & details

Explain how solar energy drives the process of evaporation from various water bodies.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Teaching This Topic

Teach evaporation and condensation as linked processes students can control and observe, not just facts to memorize. Use small-group trials to build shared evidence, then ask students to argue from their data rather than recall definitions. Avoid over-relying on diagrams before hands-on work, since many 5th graders struggle to translate symbols into real-world change.

What to Expect

Students will explain how heat, wind, and surface area control evaporation rates, describe condensation as cooling vapor, and distinguish plant transpiration from open-water evaporation through clear evidence and diagrams.

Watch Out for These Misconceptions

Common Misconception

During Pairs Experiment: Evaporation Rates, watch for students attributing faster drying only to the lamp’s heat and ignoring the room fan or dish width.

What to Teach Instead

Ask each pair to switch one variable at a time: first adjust the dish size under the same lamp, then keep the dish size and add the fan, so students isolate factors and see that multiple causes drive evaporation.

Common Misconception

During Cloud in a Jar Demo, watch for students assuming condensation only forms because of the ice cubes, not because warm air rises and cools at the jar’s top.

What to Teach Instead

Before adding ice, have students feel the inside of the jar and note the warm, moist air rising from the water below; after adding ice, ask them to point to where the air cools enough to release vapor.

Common Misconception

During Classroom Transpiration, watch for students calling the vapor from leaves the same as water lost from soil.

What to Teach Instead

Give each group two identical bags, one sealed around a leafy stem and one around a bare soil pot, and ask them to compare mass change over an hour to prove that plants, not pots, release the vapor.

Assessment Ideas

Quick Check

After Pairs Experiment: Evaporation Rates, present three photos showing a puddle shrinking, grass with dew, and steam rising. Ask students to label each with the dominant process and write one factor that sped it up or slowed it down.

Discussion Prompt

During Cloud in a Jar Demo, pause after the condensation forms and ask each small group to share one factor that would speed up their droplet’s journey from river to cloud. Record their ideas on the board to review later.

Exit Ticket

After Dew Point Hunt, students sketch a leaf and an open water puddle, then write a sentence explaining which process they observed directly and how solar energy played a role in their finding.

Extensions & Scaffolding

• Challenge advanced students to design a mini wind tunnel using a fan and a shoebox lid to test whether moving air at different speeds changes evaporation rates more than temperature alone.
• Scaffolding support students by giving them pre-labeled evaporation dishes and timers with countdown alarms to reduce setup and measurement errors.
• Deeper exploration asks students to create a class graph of all four experiments’ evaporation rates, then predict how a fifth variable, like sunlight angle, might affect the results.

Key Vocabulary

evaporation	The process where liquid water absorbs enough energy, typically from the sun, to change into water vapor, a gas, and rise into the atmosphere.
transpiration	The release of water vapor from plants through small pores in their leaves, acting as a significant contributor to atmospheric moisture.
condensation	The process where water vapor in the air cools and changes back into liquid water droplets, forming clouds or dew.
dew point	The temperature at which air becomes saturated with water vapor and condensation begins to form.