Complete Guide to Rankine to Kelvin Temperature Conversion
The Rankine Scale (°R)
The Rankine scale is an absolute temperature scale named after Scottish engineer and physicist William John Macquorn Rankine. Like Kelvin, Rankine sets zero at absolute zero, but it uses the same temperature increment as Fahrenheit, where one degree Rankine (°R) equals one degree Fahrenheit. This makes Rankine particularly useful in engineering fields where absolute temperature measurements are needed alongside Fahrenheit-based calculations, especially in thermodynamics and aerospace engineering.
The Kelvin Scale (K)
The Kelvin scale is the fundamental unit of thermodynamic temperature measurement in the International System of Units (SI). Unlike Celsius and Fahrenheit, Kelvin is an absolute temperature scale where 0 Kelvin (0 K) represents absolute zero, the theoretical point where all molecular motion ceases. Named after British physicist Lord Kelvin, this scale is essential in scientific research, physics, astronomy, and engineering applications.
Rankine to Kelvin Conversion Reference Table
| Rankine (°R) | Kelvin (K) |
|---|---|
| 0 °R | 0 K |
| 100 °R | 55.555556 K |
| 200 °R | 111.111111 K |
| 491.67 °R | 273.15 K |
| 500 °R | 277.777778 K |
| 600 °R | 333.333333 K |
| 671.67 °R | 373.15 K |
| 1000 °R | 555.555556 K |
| 2000 °R | 1111.111111 K |
Rankine and Kelvin Temperature Reference Points
Rankine to Kelvin Conversion - Frequently Asked Questions
Why multiply by 5/9 for Rankine to Kelvin?
K = °R × 5/9. One °R = 5/9 K. Both start at 0. Pure multiplication.
Where is each predominantly used?
Rankine in US engineering. Kelvin is international SI standard.
How do gas turbine engineers use this?
US engine data in °R converts to K for international standards. 3000°R = 1666.67 K.
What happens at 0°R and 0 K?
Both represent absolute zero. Only temperature with same value. Room temp: 531°R = 295 K.
Why learn both?
International career preparation. Read literature from any source without conversion errors.