You will learn
- Explain with particles.
- Test factors.
- Define humidity.
- Explain dew point simply.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- Warm air holds more vapour.
- Cooling air can make it condense.
- Wind speeds evaporation.
- Humid air slows evaporation.
Words to know
how much water vapour is in the air
the temperature at which vapour condenses
water as an invisible gas
air holding all the vapour it can
1. Discover: The foggy window
On a cool morning the classroom window is misty inside. “Warm air from the room touched the cold glass,” says Mr Boateng. “Its vapour cooled below the dew point and condensed.”
Think: Why is the mist on the inside?
2. Understand: Phase changes
Idea 1: Particles
In evaporation, fast-moving surface particles escape as water vapour. In condensation, slowing vapour particles join together as liquid.
Idea 2: Humidity
Humidity is vapour in the air. Warm air can hold more. When air is cooled to its dew point, it is saturated and vapour condenses.
Idea 3: Factors
Evaporation is faster with heat, wind, dry air and a large surface. Condensation is faster on cold surfaces and in humid air.
3. Worked examples
Example 1 (I show you): Predict
Cold can.
- Below dew point.
- Condenses.
- Drops.
Answer: Drops form.
Example 2 (We do it together): Predict
Windy day.
- Evaporation.
- Faster.
- Dry.
Answer: Clothes dry quickly.
Example 3 (You try): Explain
Humid day.
Show the steps and answer
- Full air.
- Slow dry.
- Sticky.
Answer: Evaporation is slow.
Did you know?
Warm air at 30 °C can hold about four times more water vapour than air at 10 °C.
Why this matters
Humidity affects comfort, weather and drying of food and clothes.
4. Explore: Dew point
Chill a metal can with cool water and slowly add ice, noting when drops first appear and the temperature then.
- Fill can with cool water.
- Add ice gradually.
- Stir gently.
- Record when drops appear.
Think about it: what did you notice?
What did you notice? Drops appeared at the dew point.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- ___ is water vapour in the air.
- The ___ point is where vapour condenses.
- ___ vapour is invisible.
- ___ air holds all the vapour it can.
Guided practice
Question 1. What is humidity?
Vapour amount.
Question 2. What is dew point?
Condense temp.
Question 3. What is vapour?
Gas water.
Independent practice
Level 1: Start
- What is humidity?
- What is dew point?
- What is vapour?
- What is saturated?
- What speeds evaporation?
Level 2: Grow
- Why warm holds more?
- Why mist inside?
- Why wind helps?
Level 3: Stretch
- Find dew point.
- Draw particles.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain why a cold glass gets wet outside.
Show a sample answer
Use dew point.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: Vapour condenses.
Fix: Slow.
8. Lesson summary and revision card
- I can explain with particles.
- I can test factors.
- I can define humidity.
- I can explain dew point simply.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- Warm air holds more vapour.
- Cooling air can make it condense.
- Wind speeds evaporation.
- Humid air slows evaporation.
11. Next lesson
Next lesson: Precipitation. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Define humidity and dew point. [2 marks]
- Describe the dew point test. [4 marks]
- Explain with particles. [2 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- Cool can [1]; add ice [1]; drops [1]; record temperature [1]
- Escape [1]; join [1]
- Any [1]; reason [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is humidity?
- What is dew point?
- What is vapour?
- What is saturated?
- What speeds evaporation?
- Why warm holds more?
- Why mist inside?
- Why wind helps?
- Find dew point.
- Draw particles.
Homework
Find where condensation forms in your home.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is humidity? | Vapour amount. | 1 |
| 2. What is dew point? | Condense temp. | 1 |
| 3. What is vapour? | Gas water. | 1 |
| 4. What is saturated? | Full. | 1 |
| 5. What speeds evaporation? | Heat. | 1 |
| 6. Why warm holds more? | Energy. | 1 |
| 7. Why mist inside? | Cold glass. | 1 |
| 8. Why wind helps? | Removes vapour. | 1 |
| 9. Find dew point. | Table. | 1 |
| 10. Draw particles. | Diagram. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Vapour amount.; 2 Condense temp.; 3 Gas water.; 4 Full.; 5 Heat.. Level 2: 1 Energy.; 2 Cold glass.; 3 Removes vapour.. Level 3: 1 Table.; 2 Diagram.; 3 Sentence..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Explain with particles | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Test factors | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Define humidity | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Explain dew point simply | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “The glass leaks.” Vapour condenses.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain evaporation and condensation.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child tests condensation. You do not need to be an expert to help.
- Watch a cold bottle.
- Ask “Where does the water come from?”
- Wipe up.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: explain with particles; test factors; define humidity; explain dew point simply.
Prerequisite knowledge. Grade 4 ideas: rocks and soils, weather, the water cycle basics, evaporation and condensation.
Materials. Metal can, ice, thermometer. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Chill water.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Breathe on a mirror and ask, “Why a mist?”
Explanation (10 min). Teach phase change.
Guided activity (10 min). Learners test.
Independent activity (10 min). Learners explain.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Warm or cold? Humid or dry?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “The glass leaks.” Vapour condenses.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Explain evaporation and condensation. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 5 Unit 7, topic 7; Next Generation Science Standards, Earth’s systems; Cambridge Primary Science Stage 5, Earth and space; IB Primary Years Programme, sharing the planet. These sources informed the lesson.