A value is not a change — response practice
Stage-separated edition · 2 November 2026
A value is not a change
Two 100 g samples in a 24°C room, matching cups/lids, method and 15-minute exposure. Their starts differ.
Different starting temperatures
Constructed teaching data: these values were invented for this activity, not collected in an experiment.
Sample | Start (°C) | After 15 min (°C) |
|---|---|---|
U | 14 | 19 |
V | 18 | 21 |
1. Which has the warmer final value? Which warmed more? Explain why the larger final value need not mean a larger increase.
2. Does this comparison isolate a protector effect? Explain using the starting conditions.