The Reaumur temperature scale, while now obscure, was once in common use in some parts of the

Question:

The Reaumur temperature scale, while now obscure, was once in common use in some parts of the world. The normal freezing point of water is defined as 0 degrees Reaumur and the normal boiling point of water is defined as 80 degrees Reaumur. Tolstoy’s War and Peace mentions the temperature “minus 20 degrees Reaumur.” What is this in Celsius, Fahrenheit, Kelvin and Rankine?

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