Convert BTU inch per hour per square foot per degree Fahrenheit to International table calorie per centimetre per second per degree Celsius
Convert BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) to International table calorie per centimetre per second per degree Celsius (cal(IT)/(cm·s·°C)) instantly and accurately.
Conversion Formula
cal(IT)/(cm·s·°C) = BTU·in/(h·ft²·°F) × 0.0003444823943
About BTU inch per hour per square foot per degree Fahrenheit
The BTU·in/(h·ft²·°F) equals (1055.05585262 × 0.0254 × 9)/(3600 × 0.09290304 × 5) W/(m·K) ≈0.1442 W/(m·K). The standard US k-factor unit for insulation per ASTM C177, C335, and C518. Mineral wool ≈0.25; expanded polystyrene ≈0.24; polyurethane foam ≈0.14 BTU·in/(h·ft²·°F). 1 BTU·in/(h·ft²·°F) ≈0.1442 W/(m·K).
About International table calorie per centimetre per second per degree Celsius
The cal(IT)/(cm·s·°C) equals exactly 4.1868/0.01 = 418.68 W/(m·K) (1 international table calorie = 4.1868 J). Used in pre-SI thermodynamics, steam tables, and international heat transfer references. Copper: ≈0.920 cal(IT)/(cm·s·°C). Slightly larger than cal(th)/(cm·s·°C). 1 cal(IT)/(cm·s·°C) = 418.68 W/(m·K).
Quick Reference Table
| BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) | International table calorie per centimetre per second per degree Celsius (cal(IT)/(cm·s·°C)) |
|---|---|
| 1 BTU·in/(h·ft²·°F) | 0.000344482 cal(IT)/(cm·s·°C) |
| 2 BTU·in/(h·ft²·°F) | 0.000688965 cal(IT)/(cm·s·°C) |
| 5 BTU·in/(h·ft²·°F) | 0.00172241 cal(IT)/(cm·s·°C) |
| 10 BTU·in/(h·ft²·°F) | 0.00344482 cal(IT)/(cm·s·°C) |
| 25 BTU·in/(h·ft²·°F) | 0.00861206 cal(IT)/(cm·s·°C) |
| 50 BTU·in/(h·ft²·°F) | 0.0172241 cal(IT)/(cm·s·°C) |
| 100 BTU·in/(h·ft²·°F) | 0.0344482 cal(IT)/(cm·s·°C) |