Convert Nanowatt per square metre to International table BTU per hour per square inch
Convert Nanowatt per square metre (nW/m²) to International table BTU per hour per square inch (BTU(IT)/(h·in²)) instantly and accurately.
Conversion Formula
BTU(IT)/(h·in²) = nW/m² × 2.201377296e-12
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.
About International table BTU per hour per square inch
The international table BTU per hour per square inch (BTU(IT)/(h·in²)) equals 1055.05585262/(3600×6.4516×10⁻⁴) ≈ 454.26 W/m². Used for high heat flux applications such as electronic component cooling, jet engine combustor walls, and nuclear fuel assembly design in US customary units. 1 BTU(IT)/(h·in²) ≈ 454.26 W/m².
Quick Reference Table
| Nanowatt per square metre (nW/m²) | International table BTU per hour per square inch (BTU(IT)/(h·in²)) |
|---|---|
| 1 nW/m² | 2.201 × 10-12 BTU(IT)/(h·in²) |
| 2 nW/m² | 4.403 × 10-12 BTU(IT)/(h·in²) |
| 5 nW/m² | 1.101 × 10-11 BTU(IT)/(h·in²) |
| 10 nW/m² | 2.201 × 10-11 BTU(IT)/(h·in²) |
| 25 nW/m² | 5.503 × 10-11 BTU(IT)/(h·in²) |
| 50 nW/m² | 1.101 × 10-10 BTU(IT)/(h·in²) |
| 100 nW/m² | 2.201 × 10-10 BTU(IT)/(h·in²) |