Conductivity is resistivity. , "Conductor" can be divided into silver → copper → gold → aluminum → tungsten → nickel → iron according to conductivity.
Resistivity is related to conditions such as temperature.
At 20℃
The resistivity of silver is 1.59×10-8Ω·m.
Copper measures 1.72×10-8Ω·m.
Gold measures 2.40×10-8Ω·m.
The best conductive material at room temperature is silver. The resistivity of silver at 20℃ is 1.59×10-8Ω·m. Followed by copper, the resistivity is 1.72×10-8Ω·m. The resistivity of fused quartz reaches 1.59 × 1017Ω·m. The resistivity of the alloy is relatively large, constantan is 4.8 × 10-7Ω·m, and nickel-chromium-aluminum iron is about 1.33 × 10-6Ω·m.
1. Because air contains oxygen, high temperature air will seriously corrode metal materials, so air cannot be used
2 Because air cannot be liquefied at room temperature et to the gas volume. is too big. If you want to generate electricity with high power, you need to use very large capacity fans to transport air, which is difficult to achieve with current mechanical technology.
3. requires a large area of pipes and heating surfaces, which leads to excessive consumption of metal materials.
To summarize the three points above, air cannot be used to produce electricity on a large scale. It is only necessary to transform water into steam to produce electricity.