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A perfect example of an interval scale is the Fahrenheit scale to measure temperature. The scale is made up of equal temperature units, so that the difference between 40 and 50 degrees Fahrenheit is equal to the difference between 50 and 60 degrees Fahrenheit.
The three most common temperature scales are Fahrenheit, Celsius and Kelvin. The illustration below shows identical liquid filled thermometers. Each is calibrated with one of the three temperature scales. The Fahrenheit and Celsius scales show the boiling point for water at 212oF and 100oC. The freezing point for water is 32oF and 0oC. The size of the degrees is different.