A company is developing a temperature alarm, based on the schema below, that should close an electric circuit when the temperature rises above 150°C:
| Linear coefficient of thermal expansion (x10-6K-1) | Volumetric mass density (kg/m3) | Melting point (°C) | |
|---|---|---|---|
| Brass | 13 | 8600 | 1000 |
| Copper | 17 | 8940 | 1100 |
| Iron | 11.8 | 7870 | 1500 |
| Mercury | 181 | 13540 | -39 |
| Polystyrene | 70 | 1060 | 100 |
| Steel | 12 | 7800 | 1600 |
Based on available materials and their properties, choose materials for the temperature alarm that require the smallest temperature difference to do the task.
For Material 1:
For Material 2:
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