Rankine to Rømer Conversion Calculator: Free Online Tool
Convert degrees Rankine to degrees Rømer with our free online temperature converter.
Rankine to Rømer Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Rankine).
- The converted value in Rømer will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Temperature category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Rankine to Rømer
Temperature conversions like Rankine to Rømer use specific non-linear formulas.
Formula:
First convert °R to °C: °C = (°R - 491.67) × 5/9. Then convert °C to °Rø: °Rø = °C × 21/40 + 7.5Example Calculation:
Convert 10°R:
1. °C = (10 - 491.67) × 5/9 = -267.59°C
2. °Rø = (-267.59 × 21/40) + 7.5 = -132.99°Rø
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Rankine and a Rømer?
The Rankine scale (°R or °Ra) is an absolute thermodynamic temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine. Similar to the Kelvin scale, its zero point is absolute zero, but the degree size is the same as that of the Fahrenheit scale.
The Rømer scale (°Rø) is a historical temperature scale where the freezing point of water is set at 7.5 degrees and the boiling point at 60 degrees.
Note: The Rankine is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Rømer belongs to the imperial/US customary system.
History of the Rankine and Rømer
The scale was proposed by William Rankine in 1859, shortly after the Kelvin scale was developed. It was created to provide an absolute temperature scale that directly corresponded with the Fahrenheit degrees used widely in engineering at the time.
Invented by the Danish astronomer Ole Christensen Rømer in 1701. Rømer based his scale on two points: the freezing point of brine (0 °Rø) and the boiling point of water (60 °Rø). He later observed pure water froze at 7.5 °Rø. Daniel Fahrenheit visited Rømer and reportedly based his own scale on Rømer's work, multiplying the number of degrees by four.
Common Uses for degrees Rankine and degrees Rømer
Explore the typical applications for both Rankine (imperial/US) and Rømer (imperial/US) to understand their common contexts.
Common Uses for degrees Rankine
- Engineering (Thermodynamics): Used in some engineering fields, particularly in the United States, where calculations often involve Fahrenheit. It simplifies thermodynamic calculations (like the ideal gas law) when using Imperial units.
- Historical Context: Found in older engineering texts and data.
Common Uses for degrees Rømer
- Historical Significance: Primarily of historical interest as a precursor to the Fahrenheit scale.
- Not used in modern scientific or general applications.
Frequently Asked Questions
Questions About Rankine (°R)
What is absolute zero on the Rankine scale?
Absolute zero is 0 °R, which is equivalent to -459.67 °F or -273.15 °C.
How does Rankine relate to Fahrenheit?
A change of 1 °R is equal to a change of 1 °F. The formula is °R = °F + 459.67.
How does Rankine relate to Kelvin?
The Rankine scale uses Fahrenheit degrees, while Kelvin uses Celsius degrees. Both start at absolute zero. The formula is °R = K × 9/5.
About Rømer (°Rø)
What are the freezing and boiling points of water in Rømer?
Water freezes at 7.5 °Rø and boils at 60 °Rø.
How did Rømer influence Fahrenheit?
Fahrenheit adopted Rømer's use of two reference points and expanded the scale, likely multiplying Rømer's degrees by 4 to avoid fractions and negative numbers for everyday temperatures.
How does Rømer relate to Celsius?
The relationship is °Rø = °C × 21/40 + 7.5.