watt per meter-kelvin
Thermal conductivityexact by definition
The watt per metre-kelvin is the SI unit of thermal conductivity, the k in Fourier's law: the heat in watts crossing one square metre of a one-metre-thick slab per kelvin of temperature difference across it. As the coherent SI combination the factor of 1 is exact. Copper is about 400 W/(m·K), water 0.6, still air 0.026 and fibreglass insulation about 0.04.
Watch out: Conductivity is a material property and takes no thickness. Divide it by a thickness to get a conductance, or divide a thickness by it to get an R-value. Note also that thermal conductivity and electrical conductivity share the word and nothing else: this one is W/(m·K), the electrical one is S/m.
| 1 | 1 |
One watt per meter-kelvin in every thermal conductivity unit
| 1,000 | milliwatt per meter-kelvin (mW/(m·K)) | |
| 6.93347 | BTU inch per hour square foot Fahrenheit (BTU·in/(h·ft²·°F)) | |
| 1 | watt per meter-kelvin (W/(m·K))this unit | |
| 1 | watt per meter-Celsius (W/(m·°C)) | |
| 0.860421 | kilocalorie per hour meter Celsius (kcal/(h·m·°C)) | |
| 0.577789 | BTU per hour-foot-Fahrenheit (BTU/(h·ft·°F)) | convert → |
| 0.01 | watt per centimeter-kelvin (W/(cm·K)) | |
| 0.00239006 | calorie per second centimeter Celsius (cal/(s·cm·°C)) | |
| 0.001 | kilowatt per meter-kelvin (kW/(m·K)) |
Solvers that use thermal conductivity