Convert BTU per Pound-Rankine to Joules per Kilogram-Kelvin
Instantly convert BTU per Pound-Rankine (BTU/(lb·°R)) to Joules per Kilogram-Kelvin (J/(kg·K)) with our free online calculator.
Formula: BTU/(lb·°R) to J/(kg·K) — multiply by 4186.8
Reference Table
| BTU per Pound-Rankine (BTU/(lb·°R)) | Joules per Kilogram-Kelvin (J/(kg·K)) |
|---|---|
| 1 | 4186.8 |
| 5 | 20934 |
| 10 | 41868 |
| 25 | 104670 |
| 50 | 209340 |
| 100 | 418680 |
How to Convert BTU per Pound-Rankine to Joules per Kilogram-Kelvin
Formula
To convert BTU per Pound-Rankine (BTU/(lb·°R)) to Joules per Kilogram-Kelvin (J/(kg·K)): multiply by 4186.8
Step-by-Step
- Start with your value in BTU per Pound-Rankine (BTU/(lb·°R)).
- Multiply by 4186.8 to perform the conversion.
- The result is your value expressed in Joules per Kilogram-Kelvin (J/(kg·K)).
Conversion Factor
1 BTU/(lb·°R) = 4186.8 J/(kg·K)
Reverse Factor
1 J/(kg·K) = 0.000238846 BTU/(lb·°R)
Worked Example
Convert 25 BTU per Pound-Rankine to Joules per Kilogram-Kelvin: 25 BTU/(lb·°R) = 104670 J/(kg·K)
About BTU per Pound-Rankine (BTU/(lb·°R))
An imperial specific-entropy unit dominant in US steam tables and thermodynamics textbooks. 1 BTU/(lb·°R) ≈ 4,186.8 J/(kg·K) — numerically identical to the J/(kg·K) value (since BTU/lb/°R and kJ/kg/K convert with a near-unity factor). US-edition NIST steam tables and ASME thermodynamic references list entropy in BTU/(lb·°R).
About Joule per Kilogram-Kelvin (J/(kg·K))
The SI unit of specific entropy — entropy per unit mass, which appears in mass-flow thermodynamic calculations (nozzle, turbine, compressor analyses). J/(kg·K) is the universal unit for reporting entropy in CFD simulations and thermodynamic state-table libraries (e.g., CoolProp, REFPROP). Same dimensional units as specific heat, but physically different quantities.
Quick Facts
- 1 BTU per Pound-Rankine equals 4186.8 Joules per Kilogram-Kelvin
- 1 Joule per Kilogram-Kelvin equals 0.000238846 BTU per Pound-Rankine
- BTU per Pound-Rankine is a unit of specific entropy
- Joule per Kilogram-Kelvin is a unit of specific entropy
- This conversion is commonly used in turbine design, refrigeration analysis, and power plant engineering
- The BTU per Pound-Rankine belongs to the imperial system
- The Joule per Kilogram-Kelvin belongs to the metric system
Common BTU per Pound-Rankine to Joule per Kilogram-Kelvin Conversions
| BTU per Pound-Rankine (BTU/(lb·°R)) | Joules per Kilogram-Kelvin (J/(kg·K)) |
|---|---|
| 0.01 | 41.868 |
| 0.1 | 418.68 |
| 0.25 | 1046.7 |
| 0.5 | 2093.4 |
| 1 | 4186.8 |
| 2 | 8373.6 |
| 3 | 12560.4 |
| 5 | 20934 |
| 10 | 41868 |
| 15 | 62802 |
| 20 | 83736 |
| 25 | 104670 |
| 50 | 209340 |
| 75 | 314010 |
| 100 | 418680 |
| 250 | 1046700 |
| 500 | 2093400 |
| 1000 | 4186800 |
| 5000 | 20934000 |
| 10000 | 41868000 |
Understanding BTU per Pound-Rankine
The BTU per Pound-Rankine (symbol: BTU/(lb·°R)) is a unit of specific entropy. An imperial specific-entropy unit dominant in US steam tables and thermodynamics textbooks. 1 BTU/(lb·°R) ≈ 4,186.8 J/(kg·K) — numerically identical to the J/(kg·K) value (since BTU/lb/°R and kJ/kg/K convert with a near-unity factor). US-edition NIST steam tables and ASME thermodynamic references list entropy in BTU/(lb·°R).
It belongs to the imperial measurement system.
BTU per Pound-Rankine are commonly used in turbine design, refrigeration analysis, and power plant engineering.
Understanding Joules per Kilogram-Kelvin
The Joule per Kilogram-Kelvin (symbol: J/(kg·K)) is a unit of specific entropy. The SI unit of specific entropy — entropy per unit mass, which appears in mass-flow thermodynamic calculations (nozzle, turbine, compressor analyses). J/(kg·K) is the universal unit for reporting entropy in CFD simulations and thermodynamic state-table libraries (e.g., CoolProp, REFPROP). Same dimensional units as specific heat, but physically different quantities.
It belongs to the metric measurement system.
Joules per Kilogram-Kelvin are commonly used in turbine design, refrigeration analysis, and power plant engineering.
Why Convert BTU per Pound-Rankine to Joules per Kilogram-Kelvin?
Converting between BTU per Pound-Rankine and Joules per Kilogram-Kelvin is a frequent requirement for engineers, scientists, and students working with specific entropy values. Different industries and regions favour different unit systems, so having a dependable conversion tool saves time and prevents errors in technical calculations. Whether you are verifying a specification sheet, cross-checking simulation results, or preparing a report for an international audience, accurate specific entropy conversion is essential.
Frequently Asked Questions
How do I convert BTU per Pound-Rankine to Joules per Kilogram-Kelvin?
An imperial specific-entropy unit dominant in US steam tables and thermodynamics textbooks. To convert BTU per Pound-Rankine to Joules per Kilogram-Kelvin, multiply by 4186.8. For example, 25 BTU/(lb·°R) equals 104670 J/(kg·K).
How many Joules per Kilogram-Kelvin are in 1 BTU per Pound-Rankine?
There are 4186.8 Joules per Kilogram-Kelvin in 1 BTU per Pound-Rankine.
How many BTU per Pound-Rankine are in 1 Joule per Kilogram-Kelvin?
There are 0.000238846 BTU per Pound-Rankine in 1 Joule per Kilogram-Kelvin.
What is the formula for BTU per Pound-Rankine to Joule per Kilogram-Kelvin conversion?
The formula is: multiply by 4186.8. This means 1 BTU/(lb·°R) = 4186.8 J/(kg·K).
Is a BTU per Pound-Rankine bigger than a Joule per Kilogram-Kelvin?
No. One BTU per Pound-Rankine is smaller than one Joule per Kilogram-Kelvin because 1 BTU/(lb·°R) equals 4186.8 J/(kg·K), which is greater than 1.
When do you need to convert between BTU per Pound-Rankine and Joules per Kilogram-Kelvin?
The SI unit of specific entropy — entropy per unit mass, which appears in mass-flow thermodynamic calculations (nozzle, turbine, compressor analyses). BTU per Pound-Rankine and Joule per Kilogram-Kelvin are both specific entropy units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.