Convert Celsius Heat Unit per hour per square foot to Watt per square millimetre
Convert Celsius Heat Unit per hour per square foot (CHU/(h·ft²)) to Watt per square millimetre (W/mm²) instantly and accurately.
Conversion Formula
W/mm² = CHU/(h·ft²) × 5.678263341e-6
About Celsius Heat Unit per hour per square foot
The Celsius heat unit per hour per square foot (CHU/(h·ft²)) equals (9/5)×1055.05585262/(3600×0.09290304) ≈ 5.6783 W/m². The CHU (= 9/5 BTU(IT)) uses a 1 °C temperature interval instead of 1 °F; historically used in UK and Canadian heating engineering. 1 CHU/(h·ft²) ≈ 5.6783 W/m² = (9/5) × BTU(IT)/(h·ft²).
About Watt per square millimetre
The watt per square millimetre (W/mm²) equals exactly 10⁶ W/m². Used in high-power laser material processing - cutting, welding, and additive manufacturing - and electron beam applications. A 1 kW laser focused to 1 mm² achieves 1 W/mm². Numerically equal to MW/m². 1 W/mm² = 10⁶ W/m² = 100 W/cm².
Quick Reference Table
| Celsius Heat Unit per hour per square foot (CHU/(h·ft²)) | Watt per square millimetre (W/mm²) |
|---|---|
| 1 CHU/(h·ft²) | 5.678 × 10-6 W/mm² |
| 2 CHU/(h·ft²) | 1.136 × 10-5 W/mm² |
| 5 CHU/(h·ft²) | 2.839 × 10-5 W/mm² |
| 10 CHU/(h·ft²) | 5.678 × 10-5 W/mm² |
| 25 CHU/(h·ft²) | 0.000141957 W/mm² |
| 50 CHU/(h·ft²) | 0.000283913 W/mm² |
| 100 CHU/(h·ft²) | 0.000567826 W/mm² |