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Rankine scale

Rankine scale is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Rankine scale rather than just read about it. In short: The Rankine scale ( RANG-kin) is an absolute scale of thermodynamic temperature named after the University of Glasgow engineer and physicist W. J.

Rankine scale — main illustration
Rankine scale — illustration

Key takeaways

  • Rankine scale belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Rankine scale to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Rankine scale from memory before moving on to harder problems.

Reference excerpt

The Rankine scale ( RANG-kin) is an absolute scale of thermodynamic temperature named after the University of Glasgow engineer and physicist W. J. M. Rankine, who proposed it in 1859. As on the Kelvin scale, which was first proposed in 1848, zero on the Rankine scale is absolute zero, but a temperature difference of one Rankine degree (°R or °Ra) is defined as equal to one Fahrenheit degree, rather than the Celsius degree used on the Kelvin scale. In converting from kelvin to degrees Rankine, 1 °R = 5/9 K or 1 K = 1.8 °R. A temperature of 0 K (−273.15 °C; −459.67 °F) is equal to 0 °R.

Usage The Rankine scale is used in engineering systems where heat computations are done using degrees Fahrenheit. The symbol for degrees Rankine is °R (or °Ra if necessary to distinguish it from the Rømer and Réaumur scales). By analogy with the SI unit kelvin, some authors term the unit Rankine, omitting the degree symbol. Some temperatures relating the Rankine scale to other temperature scales are shown in the table below.

See also Outline of metrology and measurement Comparison of temperature scales

Notes

References

External links

Illustrations

Rankine scale: W.J. Rankine
W.J. Rankine

Worked examples

Example 1 — a first encounter with Rankine scale

Start with the simplest possible case. Write down what Rankine scale claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Rankine scale before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Rankine scale ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Rankine scale

In research
Rankine scale appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Rankine scale in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Rankine scale is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1859 introductions, Scales of temperature, so understanding it makes those chapters shorter.
In everyday life
Look for Rankine scale outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Rankine scale in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Rankine scale means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Rankine scale out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Rankine scale in simple terms?

The Rankine scale ( RANG-kin) is an absolute scale of thermodynamic temperature named after the University of Glasgow engineer and physicist W. J.

Why does Rankine scale matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Rankine scale?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Rankine scale.

Tags

  • 1859 introductions
  • Scales of temperature

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