mW/(m·K)
milliwatt per meter-kelvin
Thermal conductivityexact by definition
The milliwatt per meter-kelvin is 10⁻³ W/(m·K), the natural unit for insulating materials and gases. Still air is 26 mW/(m·K), polyurethane foam 22, aerogel 13, and argon fill in a window unit 17.
Watch out: Insulation sales literature often quotes conductivity in mW/(m·K) and thickness in millimetres precisely because the numbers look bigger. The physics is identical to the W/(m·K) figure divided by a thousand.
| 1 mW/(m·K) | 0.001 W/(m·K) |
Solvers that use thermal conductivity