What is being measured?
Specific heat capacity is heat capacity per mass. State, composition and the thermodynamic conditions can affect measured values.
Temperature denominators are intervals. IT and thermochemical calories/BTUs must remain explicit.
Meaning of BTU IT/(lb·°F)
International-table BTU per pound Fahrenheit degree uses the symbol BTU IT/(lb·°F) in this library and measures specific heat capacity. Under the stated reference convention, 1 BTU IT/(lb·°F) = approximately 4186.8 J/(kg·K). This equivalence changes how a known value is written. It does not increase measurement accuracy or establish whether a measurement is appropriate to a real application.
Conversion method
Multiply the value by the source factor (4186.8), then divide by the target factor (1). The factor ratio expresses the same specific heat capacity measurement in the other unit.
Worked example
For a known value of 10 BTU IT/(lb·°F), the reference conversion gives 41868 J/(kg·K). Converting that result back gives approximately 10 BTU IT/(lb·°F). This reverse check helps catch a reversed factor, but matching round-trip arithmetic alone does not independently verify a source definition.
Common reference values
| Input (BTU IT/(lb·°F)) | Reference equivalent (J/(kg·K)) |
|---|---|
| 1 | 4186.8 |
| 5 | 20934 |
| 10 | 41868 |
| 25 | 104670 |
| 50 | 209340 |
| 100 | 418680 |
Compare one BTU IT/(lb·°F) with other units
| Target unit | Equivalent of 1 BTU IT/(lb·°F) | Definition guide |
|---|---|---|
| Joules per kilogram kelvin (J/(kg·K)) | 4186.8 | Read definition |
| Kilojoules per kilogram kelvin (kJ/(kg·K)) | 4.1868 | Read definition |
| Thermochemical calories per gram Celsius degree (cal th/(g·°C)) | 1.00066921606 | Read definition |
Precision and common mistakes
- Keep the source and target quantity consistent. A matching symbol is not enough to establish a compatible definition.
- Record the original measurement precision. Showing twelve significant digits in a table does not make a rounded input more precise.
- Check symbol capitalization, prefixes and any regional convention in the source. Use the displayed unit definition rather than a similarly named unit.
- Factors involving repeating fractions or π use finite numerical precision. Round the final answer to the precision justified by your input.
Use a working converter
- Specific heat capacity converter
- International-table BTU per pound Fahrenheit degree to Joules per kilogram kelvin converter
- International-table BTU per pound Fahrenheit degree to Kilojoules per kilogram kelvin converter
- International-table BTU per pound Fahrenheit degree to Thermochemical calories per gram Celsius degree converter
Source and verification scope
Examples and tables are computed from the versioned unit definitions used by the linked converters. The source access dates appear below. Computandum is independent of the cited organizations; a citation does not mean that a publisher endorses this page or an actual project.