Later assessment

Later check · Reverse the direction

Question: Which sleeve better limits cooling when water begins warmer than the room? This is a paper-data task, not a hot-water activity.

Three separate matched trials use fresh 100 g samples starting at 40°C in a 22°C room. Matching cups, lids, 20-minute exposure, and thermometer procedure are stated.

Final water temperatures after 20 minutes

Constructed teaching data: these values were invented for this activity, not collected in an experiment.

1. Find the temperature drop for each design in at least two trials. Which sleeve better limits cooling across the record?

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2. Explain the direction of net thermal-energy transfer. Why is ‘choose the lowest final temperature’ a poor rule for this goal?

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3. State a bounded conclusion and one unanswered question. What new information or test would help?

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