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the claim

Materials that conduct electricity well are proportionately better at conducting heat

the verdict
CONTESTED
the evidence cuts both ways
Recorded sources
6 sources for · 3 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that materials that conduct electricity well are proportionately better at conducting heat?

Partly. While the Wiedemann-Franz law generally establishes a proportional relationship between a material's electrical and thermal conductivities, various conditions such as specialized scattering, hydrodynamic regimes, and complex alloy structures can lead to notable deviations.

Verdict: CONTESTED · 6 sources for, 3 against · Last checked

The analysis

The claim states that materials that conduct electricity well are proportionately better at conducting heat, which is the foundational premise of the Wiedemann-Franz law. Multiple retrieved papers explicitly utilize or verify this proportionality in metals, alloys, and nanostructures (e.g., papers 0, 1, 2, 3, 6, 9), supporting the general rule. However, several recent studies (papers 5, 7, 8) document specific violations or deviations under specialized conditions like hydrodynamic transport or complex scattering mechanisms. Because the primary physical principle remains well-supported as a general rule while notable exceptions exist, the evidence overall supports the claim with recognized physical caveats.

Evidence for · 6
Effect of Electrical Contact Resistance on Measurement of Thermal Conductivity and Wiedemann-Franz Law for Individual Metallic Nanowires
2018
Silver nanowires verify the Wiedemann-Franz law, confirming that electrical and thermal conductivities scale proportionally.
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Wang, J., Wu, Z., Mao, C., Zhao, Y., Yang, J., & Chen, Y. (2018). Effect of Electrical Contact Resistance on Measurement of Thermal Conductivity and Wiedemann-Franz Law for Individual Metallic Nanowires. doi.org. https://doi.org/10.1038/s41598-018-23291-9

Evidence against · 3
Spectroscopy of heat transport and violation of the Wiedemann-Franz law in GaAs hydrodynamic mesoscopic channel.
2026
Studies in hydrodynamic channels show a temperature-dependent deviation from the Wiedemann-Franz law.
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YA, P., MAT, P., MM, G., VA, O., MD, T., AD, L., AK, B., & GM, G. (2026). Spectroscopy of heat transport and violation of the Wiedemann-Franz law in GaAs hydrodynamic mesoscopic channel.. doi.org. https://doi.org/10.1038/s41598-026-45858-7

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More for · 5
Applicability of Wiedemann-Franz Law to Thermal Conductivity of Molten Field’s Metal
2020
The Wiedemann-Franz law is conventionally used as a reliable approach to estimate thermal conductivity from electrical conductivity in metals and alloys.
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Mizuno, N., Kosai, S., & Yamasue, E. (2020). Applicability of Wiedemann-Franz Law to Thermal Conductivity of Molten Field’s Metal. doi.org. https://doi.org/10.4028/www.scientific.net/msf.985.1

MXenes for Infrared Thermal Management.
2025
MXenes exhibit advanced thermal management properties driven by a combination of high electrical and thermal conductivity.
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T, H., C, P., SM, N., J, K., H, K., Z, K., S, J., Y, G., & CM, K. (2025). MXenes for Infrared Thermal Management.. doi.org. https://doi.org/10.1021/acsnano.5c14464

First-Principles Study on the Electrical and Thermal Conductivities of Cu-Zn Binary Alloys.
2025
First-principles calculations on Cu-Zn alloys demonstrate consistent trends between electrical and thermal conductivities.
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L, H., B, P., Q, Y., G, H., C, W., R, W., & N, T. (2025). First-Principles Study on the Electrical and Thermal Conductivities of Cu-Zn Binary Alloys.. doi.org. https://doi.org/10.3390/ma18102310

Electrothermal Behaviour of Constrained Carbon/Epoxy Laminates Under Various Electric Currents.
2026
Proportionality constants between thermal and electrical conductivities are established for laminates, indicating corresponding behavior.
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G, Z. & W, S. (2026). Electrothermal Behaviour of Constrained Carbon/Epoxy Laminates Under Various Electric Currents.. doi.org. https://doi.org/10.3390/polym18080941

High thermal conductivity in metallic <i>θ</i>-TaN single crystals.
2026
Metallic single crystals demonstrate that good electrical conductors also deliver ultrahigh thermal conductivity.
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Y, L., X, Z., G, P., C, G., G, S., J, C., J, C., L, F., S, W., W, L., & B, S. (2026). High thermal conductivity in metallic <i>θ</i>-TaN single crystals.. doi.org. https://doi.org/10.1093/nsr/nwag106

More against · 2
Sublinear transport in Kagome metals from the interplay of Dirac cones and Van Hove singularities.
2025
Distinct scattering channels for charge and heat currents lead to violations of the Wiedemann-Franz law at higher temperatures.
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N, P., N, M., C, F., & Y, Z. (2025). Sublinear transport in Kagome metals from the interplay of Dirac cones and Van Hove singularities.. doi.org. https://doi.org/10.1038/s41467-025-65685-0

Hidden in plain heat: anomalous Lorenz number in the thermoelectric alloy Bi<sub>0.4</sub>Sb<sub>1.6</sub>Te<sub>3</sub>.
2025
Anomalously low Lorenz numbers and inelastic scattering processes challenge the direct proportionality of thermal and electrical conductivities in certain alloys.
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C, C., B, W., V, O., P, L., S, M., G, S., I, T., A, W., A, D., S, E. O., & B, L. (2025). Hidden in plain heat: anomalous Lorenz number in the thermoelectric alloy Bi<sub>0.4</sub>Sb<sub>1.6</sub>Te<sub>3</sub>.. doi.org. https://doi.org/10.1038/s41467-025-66578-y

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first checked04 Aug 2026
judged → CONTESTED · 3304 Aug 2026
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