2026–27 · Backup lesson · Summer & ESY 2027
Compare Surface Color in Sunlight
Adult extension of: Which Color Gets Warmer?
Unscheduled alternative · available resource
Compare the measured warming of matched dark and light surfaces under the same sunlight conditions. Use the results to discuss garden-container placement while recognizing that color is only one factor affecting temperature.
Curriculum skill focus: Solar energy, temperature comparison, prediction, measurement
01 · Learning
Objectives
- Control material, position, and timing when comparing colors.
- Record starting and later temperatures using suitable instruments.
- Use the result without claiming color alone determines heat safety.
02 · Preparation
Materials
Matching flat dark and light samples of the same material and finish if possible; paired contact temperature probes or thermometers suitable for the setup; stable tray; timer; shade location; labels; observation sheet; sunlight or supplied verified data.
03 · Practice
Adult project
- 1
Choose a practical question about dark and light garden containers or work surfaces. Inspect the matched samples, note any differences beyond color, and predict which might warm more in the same sunlight.
- 2
Record starting temperatures after both samples have been in the same shade conditions. Position the probes consistently, secure the tray, and choose recording or observation roles without requiring skin-temperature tests.
- 3
Place samples side by side in the same sunlight exposure without one shading the other. Start the timer and record cloud changes, wind, or position changes that could affect the comparison.
- 4
Measure at fixed intervals using the same method for both. If the light is too weak to show a clear difference, record that result and continue later or examine clearly labeled supplied data rather than manufacturing a conclusion.
- 5
Compare temperature changes from each starting value. Discuss whether the measured difference exceeds reading uncertainty and whether finish, moisture, thickness, or airflow might have influenced it.
- 6
Use the evidence to propose a container-placement check that also considers shade, water needs, and the plant’s temperature tolerance. Move samples safely into shade, allow them to cool, and save the measured comparison.
Evidence & interpretation
What the investigation shows
Dark surfaces often absorb more incoming visible radiation than comparable light surfaces, but temperature also depends on reflectance across wavelengths, emissivity, material, wind, and moisture. An infrared thermometer can mislead across different surface finishes; matched contact measurements are preferable here.
Practical connection
Why this work matters
Surface temperature matters for exposed pots, seating, tools, and outdoor work areas.
Participation by choice
Individual access options
- Observe from shade or indoors through a partner’s live readings or dated photographs.
- Use large displays, spoken temperatures, or a simple warmer/similar comparison based on measured values.
- Choose the recording or planning role, skip outdoor exposure entirely, and pause for comfort without losing access to the results.
Review & transfer
Reflect on the work
- How much did each sample change from its own starting temperature?
- What besides color would you check before choosing a real container location?