Question

boiling water was placed in containers made of four different materials.

material	water temperature (°c)
1	100	87	85	81
2	100	96	93	91
3	100	78	71	63
4	100	92	87	83

which material provided the best insulation against heat loss?

• material 1
• material 2
• material 3
• material 4

Explanation:

To determine the best insulation, we check which material keeps the water temperature highest over time. At 15 minutes: Material 1 is 81°C, Material 2 is 91°C, Material 3 is 63°C, Material 4 is 83°C. Material 2 has the highest temperature, meaning it lost the least heat.

Answer:

B. Material 2