Convert International table BTU per second per square foot to Nanowatt per square metre
Convert International table BTU per second per square foot (BTU(IT)/(s·ft²)) to Nanowatt per square metre (nW/m²) instantly and accurately.
Conversion Formula
nW/m² = BTU(IT)/(s·ft²) × 11356526680000
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.
About Nanowatt per square metre
The nanowatt per square metre (nW/m²) equals 10⁻⁹ W/m². Used in astrophysics and cosmology for quantifying extremely weak radiation fields, such as cosmic microwave background intensity and residual thermal emission from near-absolute-zero objects. Relevant in precision cryogenic sensor calibration. 1 nW/m² = 10⁻⁹ W/m² = 10³ pW/m².
Quick Reference Table
| International table BTU per second per square foot (BTU(IT)/(s·ft²)) | Nanowatt per square metre (nW/m²) |
|---|---|
| 1 BTU(IT)/(s·ft²) | 1.136 × 1013 nW/m² |
| 2 BTU(IT)/(s·ft²) | 2.271 × 1013 nW/m² |
| 5 BTU(IT)/(s·ft²) | 5.678 × 1013 nW/m² |
| 10 BTU(IT)/(s·ft²) | 1.136 × 1014 nW/m² |
| 25 BTU(IT)/(s·ft²) | 2.839 × 1014 nW/m² |
| 50 BTU(IT)/(s·ft²) | 5.678 × 1014 nW/m² |
| 100 BTU(IT)/(s·ft²) | 1.136 × 1015 nW/m² |