Convert Microwatt per metre kelvin to BTU inch per hour per square foot per degree Fahrenheit
Convert Microwatt per metre kelvin (µW/(m·K)) to BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) instantly and accurately.
Conversion Formula
BTU·in/(h·ft²·°F) = µW/(m·K) × 6.933471799e-6
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 inch per hour per square foot per degree Fahrenheit
The BTU·in/(h·ft²·°F) equals (1055.05585262 × 0.0254 × 9)/(3600 × 0.09290304 × 5) W/(m·K) ≈0.1442 W/(m·K). The standard US k-factor unit for insulation per ASTM C177, C335, and C518. Mineral wool ≈0.25; expanded polystyrene ≈0.24; polyurethane foam ≈0.14 BTU·in/(h·ft²·°F). 1 BTU·in/(h·ft²·°F) ≈0.1442 W/(m·K).
Quick Reference Table
| Microwatt per metre kelvin (µW/(m·K)) | BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) |
|---|---|
| 1 µW/(m·K) | 6.933 × 10-6 BTU·in/(h·ft²·°F) |
| 2 µW/(m·K) | 1.387 × 10-5 BTU·in/(h·ft²·°F) |
| 5 µW/(m·K) | 3.467 × 10-5 BTU·in/(h·ft²·°F) |
| 10 µW/(m·K) | 6.933 × 10-5 BTU·in/(h·ft²·°F) |
| 25 µW/(m·K) | 0.000173337 BTU·in/(h·ft²·°F) |
| 50 µW/(m·K) | 0.000346674 BTU·in/(h·ft²·°F) |
| 100 µW/(m·K) | 0.000693347 BTU·in/(h·ft²·°F) |