Convert BTU inch per hour per square foot per degree Fahrenheit to Thermochemical 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 Thermochemical calorie per centimetre per second per degree Celsius (cal(th)/(cm·s·°C)) instantly and accurately.
Conversion Formula
cal(th)/(cm·s·°C) = BTU·in/(h·ft²·°F) × 0.0003447129275
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 Thermochemical calorie per centimetre per second per degree Celsius
The cal(th)/(cm·s·°C) equals exactly 4.184/0.01 = 418.4 W/(m·K) (1 thermochemical calorie = 4.184 J). The CGS thermal conductivity unit dominant in US physics and chemistry before SI adoption. Copper: ≈0.921; aluminium: ≈0.489 cal(th)/(cm·s·°C). Not equal to cal(IT)/(cm·s·°C). 1 cal(th)/(cm·s·°C) = 418.4 W/(m·K).
Quick Reference Table
| BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) | Thermochemical calorie per centimetre per second per degree Celsius (cal(th)/(cm·s·°C)) |
|---|---|
| 1 BTU·in/(h·ft²·°F) | 0.000344713 cal(th)/(cm·s·°C) |
| 2 BTU·in/(h·ft²·°F) | 0.000689426 cal(th)/(cm·s·°C) |
| 5 BTU·in/(h·ft²·°F) | 0.00172356 cal(th)/(cm·s·°C) |
| 10 BTU·in/(h·ft²·°F) | 0.00344713 cal(th)/(cm·s·°C) |
| 25 BTU·in/(h·ft²·°F) | 0.00861782 cal(th)/(cm·s·°C) |
| 50 BTU·in/(h·ft²·°F) | 0.0172356 cal(th)/(cm·s·°C) |
| 100 BTU·in/(h·ft²·°F) | 0.0344713 cal(th)/(cm·s·°C) |