"Constructed teaching data: these values were invented for this activity, not collected in an experiment." Dataset ID, Conditions,"Fresh matched 100 g samples starting at 11°C; 23°C room; 15 min. New design changes both seam overlap and layer count; all other conditions match. Covered liquid water; cups/lids, mass, starting temperature, duration, exposure and reading procedure match within and across trials. Surroundings stay at the stated room temperature. No ice, phase change, active heating/cooling, direct sunlight or meaningful evaporative cooling. Each trial uses fresh samples. Accuracy is not supplied." Units,"{""temperature"": ""°C"", ""time"": ""min"", ""mass"": ""g""}" Paired trial,Old final °C,New final °C 1,17,15 2,16,14 3,17,15