Interval Scale:

An interval scale is a measurement scale in which a certain distance along the scale means the same thing no matter where on the scale you are, but where "0" on the scale does not represent the absence of the thing being measured. Fahrenheit and Celsius temperature scales are examples.

See also: nominal scale, ordinal scale, ratio scale

This topic is covered in the following online courses at statistics.com:

• Introductory Statistics
• Understanding Standardized Testing