Convert Thermochemical BTU per pound per degree Fahrenheit to International table BTU per pound per degree Fahrenheit
Convert Thermochemical BTU per pound per degree Fahrenheit (BTU(th)/(lb·°F)) to International table BTU per pound per degree Fahrenheit (BTU(IT)/(lb·°F)) instantly and accurately.
Conversion Formula
BTU(IT)/(lb·°F) = BTU(th)/(lb·°F) × 0.9993312315
About Thermochemical BTU per pound per degree Fahrenheit
The thermochemical BTU per pound per degree Fahrenheit (BTU(th)/(lb·°F)) equals exactly 4184 J/(kg·K) (derived: 1 BTU(th) = 1054.350264 J; /lb/°F). Numerically identical to cal(th)/(g·°C) because both are defined via the thermochemical calorie. Used in older American thermodynamic tables. Water ≈1 BTU(th)/(lb·°F). 1 BTU(th)/(lb·°F) = 4184 J/(kg·K).
About International table BTU per pound per degree Fahrenheit
The international table BTU per pound per degree Fahrenheit (BTU(IT)/(lb·°F)) equals (1055.05585262 × 9)/(0.45359237 × 5) J/(kg·K) = 4186.8 J/(kg·K). The standard US unit for specific heat capacity in ASHRAE, ASTM, and mechanical engineering references. Water: 1.000 BTU(IT)/(lb·°F); steel: ≈0.108; air: ≈0.240. 1 BTU(IT)/(lb·°F) = 4186.8 J/(kg·K).
Quick Reference Table
| Thermochemical BTU per pound per degree Fahrenheit (BTU(th)/(lb·°F)) | International table BTU per pound per degree Fahrenheit (BTU(IT)/(lb·°F)) |
|---|---|
| 1 BTU(th)/(lb·°F) | 0.999331 BTU(IT)/(lb·°F) |
| 2 BTU(th)/(lb·°F) | 1.99866 BTU(IT)/(lb·°F) |
| 5 BTU(th)/(lb·°F) | 4.99666 BTU(IT)/(lb·°F) |
| 10 BTU(th)/(lb·°F) | 9.99331 BTU(IT)/(lb·°F) |
| 25 BTU(th)/(lb·°F) | 24.9833 BTU(IT)/(lb·°F) |
| 50 BTU(th)/(lb·°F) | 49.9666 BTU(IT)/(lb·°F) |
| 100 BTU(th)/(lb·°F) | 99.9331 BTU(IT)/(lb·°F) |