Convert Hour-degree Fahrenheit per BTU to Millikelvin per watt
Convert Hour-degree Fahrenheit per BTU (h·°F/BTU) to Millikelvin per watt (mK/W) instantly and accurately.
Conversion Formula
mK/W = h·°F/BTU × 1895.634241
About Hour-degree Fahrenheit per BTU
The h·°F/BTU equals (5/9 × 3600)/1055.05585262 K/W ≈ 1.8956 K/W. It is the traditional US unit for thermal resistance in HVAC, building science, and insulation engineering. A pipe fitting with R = 1 h·°F/BTU passes 1 BTU/h per °F driving difference. Appears in ASHRAE handbooks, ASTM C177, and older US plumbing codes. 1 h·°F/BTU ≈ 1.8956 K/W.
About Millikelvin per watt
The millikelvin per watt (mK/W) equals exactly 10⁻³ K/W. It is used for ultra-low thermal resistances in high-conductivity materials such as diamond heat spreaders (≈ 0.3 mK/W per mm thickness for 1 cm² area), liquid metal TIMs, and cryogenic heat links. Measuring at this scale requires precision power dissipation and calorimetric temperature sensing. 1 mK/W = 10⁻³ K/W.
Quick Reference Table
| Hour-degree Fahrenheit per BTU (h·°F/BTU) | Millikelvin per watt (mK/W) |
|---|---|
| 1 h·°F/BTU | 1895.63 mK/W |
| 2 h·°F/BTU | 3791.27 mK/W |
| 5 h·°F/BTU | 9478.17 mK/W |
| 10 h·°F/BTU | 18956.3 mK/W |
| 25 h·°F/BTU | 47390.9 mK/W |
| 50 h·°F/BTU | 94781.7 mK/W |
| 100 h·°F/BTU | 189563 mK/W |