Convert International table BTU per pound per degree Fahrenheit to Joule per kilogram kelvin
Convert International table BTU per pound per degree Fahrenheit (BTU(IT)/(lb·°F)) to Joule per kilogram kelvin (J/(kg·K)) instantly and accurately.
Conversion Formula
J/(kg·K) = BTU(IT)/(lb·°F) × 4186.8
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).
About Joule per kilogram kelvin
The joule per kilogram kelvin (J/(kg·K)) is the SI coherent unit for specific heat capacity, defined by the relation Q = mcΔT. Water ≈4182, iron ≈449, aluminium ≈897, copper ≈385, glass ≈840 J/(kg·K). Referenced in ISO 31-4 and all major international standards. 1 J/(kg·K) = 1 J/(kg·°C) = 10⁻³ kJ/(kg·K).
Quick Reference Table
| International table BTU per pound per degree Fahrenheit (BTU(IT)/(lb·°F)) | Joule per kilogram kelvin (J/(kg·K)) |
|---|---|
| 1 BTU(IT)/(lb·°F) | 4186.8 J/(kg·K) |
| 2 BTU(IT)/(lb·°F) | 8373.6 J/(kg·K) |
| 5 BTU(IT)/(lb·°F) | 20934 J/(kg·K) |
| 10 BTU(IT)/(lb·°F) | 41868 J/(kg·K) |
| 25 BTU(IT)/(lb·°F) | 104670 J/(kg·K) |
| 50 BTU(IT)/(lb·°F) | 209340 J/(kg·K) |
| 100 BTU(IT)/(lb·°F) | 418680 J/(kg·K) |