Convert Milliwatt per square metre to International table BTU per second per square foot
Convert Milliwatt per square metre (mW/m²) to International table BTU per second per square foot (BTU(IT)/(s·ft²)) instantly and accurately.
Conversion Formula
BTU(IT)/(s·ft²) = mW/m² × 8.805509184e-8
About Milliwatt per square metre
The milliwatt per square metre (mW/m²) equals 10⁻³ W/m². Relevant in geothermal surveys: global average continental heat flux ≈ 65 mW/m², oceanic ≈ 101 mW/m². Used in building physics for quantifying very small heat leakage through ultra-high-performance insulation. 1 mW/m² = 10⁻³ W/m² = 1 erg/(s·cm²).
About International table BTU per second per square foot
The international table BTU per second per square foot (BTU(IT)/(s·ft²)) equals 1055.05585262/0.09290304 ≈ 11357 W/m² (= 3600 × BTU(IT)/(h·ft²)). Used for extreme heat flux: atmospheric re-entry aerodynamic heating, solid rocket nozzle throat, and nuclear reactor thermal hydraulics design. 1 BTU(IT)/(s·ft²) ≈ 11357 W/m².
Quick Reference Table
| Milliwatt per square metre (mW/m²) | International table BTU per second per square foot (BTU(IT)/(s·ft²)) |
|---|---|
| 1 mW/m² | 8.806 × 10-8 BTU(IT)/(s·ft²) |
| 2 mW/m² | 1.761 × 10-7 BTU(IT)/(s·ft²) |
| 5 mW/m² | 4.403 × 10-7 BTU(IT)/(s·ft²) |
| 10 mW/m² | 8.806 × 10-7 BTU(IT)/(s·ft²) |
| 25 mW/m² | 2.201 × 10-6 BTU(IT)/(s·ft²) |
| 50 mW/m² | 4.403 × 10-6 BTU(IT)/(s·ft²) |
| 100 mW/m² | 8.806 × 10-6 BTU(IT)/(s·ft²) |