Convert Microwatt per metre kelvin to BTU per hour per foot per degree Fahrenheit
Convert Microwatt per metre kelvin (µW/(m·K)) to BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) instantly and accurately.
Conversion Formula
BTU/(h·ft·°F) = µW/(m·K) × 5.777893165e-7
About Microwatt per metre kelvin
The microwatt per metre kelvin (µW/(m·K)) equals exactly 10⁻⁶ W/(m·K). Used for near-vacuum conditions and evacuated superinsulation systems where the effective thermal conductivity falls well below the mW/(m·K) range. Evacuated multi-layer insulation (MLI) at high vacuum can reach 0.001-10 µW/(m·K) effective conductivity. Completes the SI prefix chain below mW/(m·K). 1 µW/(m·K) = 10⁻⁶ W/(m·K) = 10⁻³ mW/(m·K).
About BTU per hour per foot per degree Fahrenheit
The BTU/(h·ft·°F) equals (1055.05585262 × 9)/(3600 × 0.3048 × 5) W/(m·K) ≈1.7307 W/(m·K). Standard US thermal conductivity unit in ASHRAE Handbook and ASTM C1045. Copper: ≈223; carbon steel: ≈26; brick: ≈0.44; glass fibre insulation: ≈0.025 BTU/(h·ft·°F). 1 BTU/(h·ft·°F) = 12 BTU·in/(h·ft²·°F) ≈1.7307 W/(m·K).
Quick Reference Table
| Microwatt per metre kelvin (µW/(m·K)) | BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) |
|---|---|
| 1 µW/(m·K) | 5.778 × 10-7 BTU/(h·ft·°F) |
| 2 µW/(m·K) | 1.156 × 10-6 BTU/(h·ft·°F) |
| 5 µW/(m·K) | 2.889 × 10-6 BTU/(h·ft·°F) |
| 10 µW/(m·K) | 5.778 × 10-6 BTU/(h·ft·°F) |
| 25 µW/(m·K) | 1.444 × 10-5 BTU/(h·ft·°F) |
| 50 µW/(m·K) | 2.889 × 10-5 BTU/(h·ft·°F) |
| 100 µW/(m·K) | 5.778 × 10-5 BTU/(h·ft·°F) |