The metallic resistivity and temperature coefficient table is a fundamental tool in engineering and physics, as it offers crucial information about how different metallic materials conduct electricity and how their resistance varies with temperature. This data is essential for the design of electronic devices, heating systems and other industrial applications where precision in electrical conduction and thermal behavior is required.
Understanding Metallic Resistivity
Resistivity is an intrinsic property that measures the opposition that a material offers to the flow of electrical current. It is influenced by the chemical composition of the metal, its crystalline structure and the temperature to which it is subjected. Metals such as copper and silver have very low resistivities, making them ideal for use in electrical conduction applications such as wires and cables. On the other hand, materials such as nickel and tungsten have greater resistivity, making them useful in applications such as heating elements.
Temperature Coefficient of Resistance
The temperature coefficient of resistance indicates how the resistivity of a material changes with temperature. Generally, for pure metals, resistivity increases with increasing temperature, which is described by the positive temperature coefficient. This behavior can be explained by the fact that, as the temperature increases, the atoms in the metal vibrate more intensely, making it difficult for electrons to pass through, which increases the material's resistance. On the other hand, in some semiconductor materials and in specific situations, a negative coefficient can be observed, where the resistivity decreases with increasing temperature.
These parameters are essential for engineers and designers working with electronic and thermal applications, as they allow them to adjust specifications and guarantee the efficiency and safety of the products and systems developed. Understanding these properties helps in the appropriate choice of materials for each application, taking into account operating conditions and performance requirements.
Table of metallic resistivity and temperature coefficient
| Materials | Temperature t/℃ |
Electrical resistivity p /×10 -8 Ω·m |
Temperature coefficient of resistance at R /℃ -1 |
| Silver | 20 | 1,586 | 0.0038(20°C) |
| Copper | 20 | 1,678 | 0.00393(20°C) |
| Gold | 20 | 2:40 am | 0.00324(20°C) |
| Aluminum | 20 | 2.6548 | 0.00429(20°C) |
| Calcium | 0 | 3.91 | 0.00416(0°C) |
| Beryllium | 20 | 4.0 | 0.025(20°C) |
| Magnesium | 20 | 4.45 | 0.0165(20°C) |
| Molybdenum | 0 | 5.2 | |
| Iridium | 20 | 5.3 | 0.003925(0℃~100℃) |
| Tungsten | 27 | 5.65 | |
| Zinc | 20 | 5,196 | 0.00419(0℃~100℃) |
| Cobalt | 20 | 6.64 | 0.00604(0℃~100℃) |
| Nickel | 20 | 6.84 | 0.0069(0℃~100℃) |
| Cadmium | 0 | 6.83 | 0.0042(0℃~100℃) |
| Indian | 20 | 8.37 | |
| Iron | 20 | 9.71 | 0.00651(20°C) |
| Platinum | 20 | 10.6 | 0.00374(0℃~60℃) |
| Tin | 0 | 11.0 | 0.0047(0℃~100℃) |
| Rubidium | 20 | 12.5 | |
| Chrome | 0 | 12.9 | 0.003(0℃~100℃) |
| Gallium | 20 | 17.4 | |
| Thallium | 0 | 18.0 | |
| Cesium | 20 | 20 | |
| Lead | 20 | 20,684 | (0.0037620°C~40°C) |
| Antimony | 0 | 39.0 | |
| Titanium | 20 | 42.0 | |
| Mercury | 50 | 98.4 | |
| Manganese | 23~100 | 185.0 |
