electrical resistance - Why is stainless steel a poor conductor of ...
2014年1月9日 · When the lattice has imperfections the flow of electrons is retarded. Stainless steel is an alloy of iron with up to about 25% chromium (and sometimes a small amount of nickel or carbon) added for corrosion resistance. The chromium atoms disrupt the regular iron lattice and increase the chances of inelastic collisions with moving electrons.
What metal (or any other material) is a good thermal conductor …
2021年7月14日 · Diamond is a excellent conductor of heat (heat conductivity five times higher than copper!) while being a very good electrical insulator. Of course its cost is prohibitive except for small parts made of industrial diamond.
Is thermal conductivity correlated with speed of sound in metals?
2018年10月21日 · I used data from Engineering Toolbox's pages Speed of Sound in common Solids and Thermal Conductivity of Metals. The speed of sound dataset was the limiting set, so I was only able to get data on both for 11 metals Aluminum, Beryllium, Brass, Copper, Gold, Iron, Lead, Silver, Steel (low carbon steel), Stainless Steel, and Titanium:
If water is not a good conductor, why are we advised to avoid …
2017年5月20日 · Silver has a conductivity of 63 000 000 S/m, stainless steel has 1 450 000 S/m, silver conducts electricity 43 times better than stainless steel! (I am writing the numbers out because the difference is hidden for laymen if you use unfamiliar scientific notation). S is an unit called siemens, and siemens per meter (S/m) is the SI unit of ...
Why are steel thermal mugs much better than plastic ones?
2020年5月31日 · First of all, steel is stronger and more rigid than most plastics, so you can draw a higher vacuum level without atmospheric pressure simply crushing the outer wall. Second, a stainless steel cup can almost certainly be sold for a higher price, making it easier for a vendor to spend the extra money to draw a higher vacuum. $\endgroup$ –
thermal radiation - Will stainless steel heat up faster than a ...
2022年3月6日 · From one website I gathered the specific heat for stainless steel 316 is 490 J/kg.K while thermal conductivity is 13 W/m.K. For cordierite it's up to 850 and 1.7 respectively. So the heat capacity for the stainless steel is about 40% lower, …
Why thermal conductivity increases with temperature?
2016年5月23日 · Following the Wiedemann–Franz law, thermal conductivity of metals is approximately proportional to the absolute temperature (in kelvin) times electrical conductivity. In pure metals the electrical conductivity decreases with increasing temperature and thus the product of the two, the thermal conductivity, stays approximately constant.
Why do metals have high optical reflectivity?
2018年8月26日 · Facts (1) and (2) lead to a large, Drude-like conductivity of the metal, which in the visible range is primarily imaginary (meaning the oscillating electrical current in the metal excited by the light is essentially $\pi/2$ out of phase with the light). Thus, the re-emitted light is completely out of phase, and so the light’s electric field ...
thermodynamics - Why do most metals have high thermal …
2022年5月18日 · For thermal conductivity, there are roughly two contributions: phonons and quasiparticles (e.g. electrons). Typically in metals, the electronic contribution dominates over the phononic one. Then, metals have high thermal conductivity for roughly the same reason they have high electrical conductivity: there are a lot of free electrons around ...
thermodynamics - Why does the thermal conductivity of 'pure' …
2017年5月1日 · Totton's Steel Heat Treatment Handbook reports that the thermal conductivity "decreases with increasing temperature for pure iron, plain carbon steels, and low-alloy steels", whereas it increases for "high-alloy steels such as ferritic and martensitic steels":