Which material has the highest thermal conductivity?

Question

BlackTom AI · Accepted Answer

To determine which material has the highest thermal conductivity, let's evaluate each option in turn.
Option 1: Air. Air is a very poor conductor of heat, with thermal conductivity around 0.024 W/m·K, making it an excellent insulator rather than a good conductor. This choice is not correct if we seek the highest conductivity.
Option 2: Fiberglass. Fiberglass contains trapped air and is designed for insulation; its effective thermal conductivity is low (roughly 0.04–0.05 W/m·K). While useful for insulation, it does not offer high heat transfer, so this is not the highest among the options.
Option 3: Window glass. Typical window glass has a thermal conductivity on the order of about 1 W/m·K. This is significantly higher than air or fiberglass but far below metals and crystalline carbon materials, so it is not the maximum here.
Option 4: Diamond. Diamond is renowned for its exceptionally high thermal conductivity, often cited in the range of hundreds to a few thousand W/m·K due to its strong covalent bonds and highly crystalline lattice that support efficient phonon transport. This sets it apart as a superb heat conductor among common materials.
Option 5: Aluminum. Aluminum is a metal with relatively high thermal conductivity, around 200–250 W/m·K, which is strong for a metal but still well below Diamond’s capability in typical comparisons. 
Overall, comparing these materials shows a wide gap between the insulators (air, fiberglass) and the conductors (glass, aluminum), with Diamond standing out as the most conductive due to its crystal structure and bonding.}

Which material has the highest thermal conductivity?单项选择题

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