The slope of the Fahrenheit scale matches that of the Rankine scale. I would still say that the in the Rankine scale percentage increases make sense, and Fahre

The slope of the Fahrenheit scale matches that of the Rankine scale. I would still say that the in the Rankine scale percentage increases make sense, and Fahrenheit changes to not. The thing that matters isn't the slope, but the zero point; "X% farther from absolute zero" is a useful measurement, "X% farther from an arbitrary zero point" is not. Especially when negative or zero temperatures are involved.