in²·h·°F/BTU
square inch hour Fahrenheit per BTU
Areal thermal resistanceexact by definition
The square inch hour Fahrenheit per BTU is 1.222987382 × 10⁻³ m²·K/W, or exactly one 144th of a US R-value. It is the North American thermal interface unit, the imperial twin of °C·cm²/W: a grease at 0.1 °C·cm²/W is about 0.08 in²·h·°F/BTU.
| 1 in²·h·°F/BTU | 0.0012229874 RSI (m²·K/W) |
Solvers that use areal thermal resistance