Convert Watt per square metre kelvin to International table BTU per second per square foot per degree Fahrenheit
Convert Watt per square metre kelvin (W/(m²·K)) to International table BTU per second per square foot per degree Fahrenheit (BTU(IT)/(s·ft²·°F)) instantly and accurately.
Conversion Formula
BTU(IT)/(s·ft²·°F) = W/(m²·K) × 4.891949547e-5
About Watt per square metre kelvin
The watt per square metre kelvin (W/(m²·K)) is the SI coherent unit for heat transfer coefficient (ISO 80000-5). Typical values: free convection in still air 2-25 W/(m²·K), forced-air cooling 25-250 W/(m²·K), natural water convection 200-1000 W/(m²·K), forced water up to 10 000 W/(m²·K), nucleate boiling up to 100 000 W/(m²·K). 1 W/(m²·K) = 1 J/(s·m²·K).
About International table BTU per second per square foot per degree Fahrenheit
The international table BTU per second per square foot per degree Fahrenheit (BTU(IT)/(s·ft²·°F)) equals ≈ 20442 W/(m²·K) (= 3600 × BTU(IT)/(h·ft²·°F)). Encountered in atmospheric re-entry aerodynamic heating analysis, solid rocket motor nozzle throat design, and nuclear reactor thermal-hydraulics with peak surface heat transfer rates. 1 BTU(IT)/(s·ft²·°F) ≈ 20442 W/(m²·K).
Quick Reference Table
| Watt per square metre kelvin (W/(m²·K)) | International table BTU per second per square foot per degree Fahrenheit (BTU(IT)/(s·ft²·°F)) |
|---|---|
| 1 W/(m²·K) | 4.892 × 10-5 BTU(IT)/(s·ft²·°F) |
| 2 W/(m²·K) | 9.784 × 10-5 BTU(IT)/(s·ft²·°F) |
| 5 W/(m²·K) | 0.000244597 BTU(IT)/(s·ft²·°F) |
| 10 W/(m²·K) | 0.000489195 BTU(IT)/(s·ft²·°F) |
| 25 W/(m²·K) | 0.00122299 BTU(IT)/(s·ft²·°F) |
| 50 W/(m²·K) | 0.00244597 BTU(IT)/(s·ft²·°F) |
| 100 W/(m²·K) | 0.00489195 BTU(IT)/(s·ft²·°F) |