Grade 4 · Science
Compare prototypes with a fair test
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A team wants to test how insulation thickness affects its model. It can use the same material and starting water temperature. Which comparison best isolates the effect of insulation thickness?
- Use different volumes without recording them.
- Change material and starting temperature together.
- Change thickness while keeping material and starting temperature the same.
- Ignore the final temperature.
See the answer & why
Change thickness while keeping material and starting temperature the same.
Only the named design feature changes, so the comparison gives clearer evidence about that feature.
A little hint: Change one feature while keeping other important test conditions consistent.
Name the feature being tested and the outcome you will measure.
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