Convert Thermochemical BTU per pound per degree Fahrenheit to Joule per kilogram kelvin
Convert Thermochemical BTU per pound per degree Fahrenheit (BTU(th)/(lb·°F)) to Joule per kilogram kelvin (J/(kg·K)) instantly and accurately.
Conversion Formula
J/(kg·K) = BTU(th)/(lb·°F) × 4184
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 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
| Thermochemical BTU per pound per degree Fahrenheit (BTU(th)/(lb·°F)) | Joule per kilogram kelvin (J/(kg·K)) |
|---|---|
| 1 BTU(th)/(lb·°F) | 4184 J/(kg·K) |
| 2 BTU(th)/(lb·°F) | 8368 J/(kg·K) |
| 5 BTU(th)/(lb·°F) | 20920 J/(kg·K) |
| 10 BTU(th)/(lb·°F) | 41840 J/(kg·K) |
| 25 BTU(th)/(lb·°F) | 104600 J/(kg·K) |
| 50 BTU(th)/(lb·°F) | 209200 J/(kg·K) |
| 100 BTU(th)/(lb·°F) | 418400 J/(kg·K) |