Science · Kindergarten · Sunlight and Weather Patterns · Weeks 19-27

Keeping Things Warm or Cool

Students explore ways to keep surfaces cool when the sun is shining brightly or keep things warm.

• Common Core State Standards
• K-PS3-1
• K-PS3-2

About This Topic

This topic connects directly to students' prior learning about sunlight warming surfaces and extends it to a practical design challenge: how do we keep something cool in the sun, or keep something warm when we need to? Aligned with K-PS3-1 and K-PS3-2, students investigate how different materials affect temperature and design simple structures that reduce or retain heat from sunlight.

Students quickly discover that material and color both matter. A black piece of construction paper left in the sun warms significantly faster than a white one. A foil-covered cup keeps water cooler longer than an uncovered one. These comparative investigations give students clear, observable evidence that material choice affects how sunlight interacts with an object, forming the basis for their design decisions.

Active learning is essential in this topic because the design challenge requires students to test materials, observe results, and revise their approach. Students who select a material, build a simple cover or shade structure, and then check whether their object stayed cooler or warmer than an uncovered control have experienced the full engineering design loop. That cycle of design, test, and reflect delivers both the science content and the engineering thinking simultaneously.

Key Questions

1. Design a method to keep a surface cool when the sun is shining brightly.
2. Compare materials that keep things warm versus materials that keep things cool.
3. Justify why wearing light-colored clothes helps us stay cool in the sun.

Learning Objectives

• Compare the effectiveness of different materials in insulating against heat transfer from sunlight.
• Design a simple shade structure to keep a surface cooler.
• Explain why light-colored clothing helps keep a person cooler in direct sunlight.
• Identify materials that absorb sunlight and materials that reflect sunlight.

Before You Start

Properties of Objects

Why: Students need to be familiar with different materials and their observable properties before comparing how they interact with sunlight.

Sunlight and Shadows

Why: Understanding that sunlight travels and can be blocked is foundational for exploring how it affects temperature.

Key Vocabulary

absorb	To take in sunlight or heat without reflecting it.
reflect	To bounce sunlight or heat off a surface.
insulate	To prevent heat from passing through a material.
temperature	How hot or cold something is.

Watch Out for These Misconceptions

Common Misconception

Darker materials are always better at everything.

What to Teach Instead

Students sometimes assume dark colors look stronger and must perform better in all situations. Testing dark versus light materials in the sun shows clearly that dark colors absorb more heat, which is useful for warming but harmful for keeping something cool. The comparative investigation makes this counterintuitive result undeniable when students feel the difference themselves.

Common Misconception

Any covering will keep something cold.

What to Teach Instead

Students may assume any cover blocks heat. Testing an uncovered ice cube against one covered in black paper, which melts faster, surprises students and reinforces that material choice matters far more than simply having a covering. This surprise is valuable precisely because it requires students to revise their prediction and think about why.

Active Learning Ideas

Inquiry Circle: Cool Cover Test

Pairs receive four small identical containers and four covering materials: aluminum foil, black construction paper, white cloth, and no cover. They fill each with the same amount of room-temperature water, place them in a sunny window for 20 minutes, and compare which stayed coolest and which warmed most.

30 min·Pairs

Simulation Game: Keep the Ice Cube Alive

Small groups receive an ice cube and a bag of materials: foil, cotton balls, plastic wrap, and construction paper. They have 15 minutes to build a cold keeper for the ice cube. Groups place all cubes on the table and observe which one melts last over the next 20 minutes, then explain why their material choice worked or did not.

35 min·Small Groups

Think-Pair-Share: Light Colors and Dark Colors

Show a photo of two cars parked in the sun, one white and one black. Ask students which would be hotter inside and why. Pairs share their reasoning before the class tests a version of this with two pieces of construction paper placed in the sun.

15 min·Pairs

Gallery Walk: Design Review

After each group completes a shade or insulation design, students post a drawing of their design labeled with the materials used. The class walks to view each design and places a sticky note on ones where they can explain why a specific material was a good choice for blocking or holding heat.

20 min·Pairs

Real-World Connections

• Architects and city planners consider building materials and colors when designing parks and public spaces to make them comfortable for people on hot, sunny days.
• Clothing designers choose fabrics and colors for summer wear, like light-colored cotton shirts, to help people stay cool.
• Farmers use shade cloths over crops to protect them from intense sun, regulating the temperature to help plants grow.

Assessment Ideas

Exit Ticket

Give students a picture of a sunny day. Ask them to draw one thing that would help keep a playground surface cool and write one word explaining why it works (e.g., 'shade tree' - 'blocks sun').

Quick Check

Hold up two different materials, like dark paper and aluminum foil. Ask students to predict which one will get hotter in the sun and explain their reasoning using the terms 'absorb' or 'reflect'.

Discussion Prompt

Ask students: 'Imagine you are going to play outside on a very sunny day. What color shirt would you choose to wear and why? Use the word 'cool' in your answer.'

Frequently Asked Questions

How do I measure temperature change without thermometers in Kindergarten?

Use a simple relative system. Students place two fingers, one from each hand, on two different surfaces after sun exposure and describe which hand feels warmer. Alternatively, use standard ice cubes and measure progress by sight: which cube has the larger puddle after ten minutes? These comparison methods are age-appropriate and still produce clear, discussable data without requiring precise measurement tools.

What materials give the clearest results for a warming and cooling investigation?

Aluminum foil (reflects, keeps things coolest), black construction paper (absorbs, warms fastest), white fabric (moderate reflector), and no cover (the control) give a clear spread of results. Keep the containers identical and the water volumes the same to isolate material as the single variable. Results are clear enough in 15 to 20 minutes of direct sun exposure.

How does this topic connect to students' everyday experiences?

Light-colored clothing in summer, black car seats that burn on a hot day, wearing dark colors to stay warm in winter, and stadium shade structures are all real-world applications students can connect to. Starting with one personal connection before the investigation, such as asking who has touched a hot car seat, gives students a reason to care about the results and makes the science feel relevant.

How does active design and testing support learning about heat and light?

When students select materials, build a structure, and check the result, they are experiencing cause and effect from the inside out. The material they chose either worked or it did not, and if it did not, they need to figure out why. That feedback from their own design decision is far more instructive than being told which material works best, and it makes material properties memorable because they came from the student's own experiment.